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Comparing Quantities Class 8 Questions And Answers provided here. These NCERT Solutions are created by expert team at craeers360 keeping the latest syllabus and pattern of CBSE 2024-25. This chapter includes several important topics, like ratios, percentages, discount, profit & loss, and simple and compound interest. The ratio of two quantities is known as comparing quantity. In this chapter, we are going to compare quantities like marks of two students, the height of two persons, a comparison of profit, sales value, etc.
In the NCERT solutions for Class 8 Maths chapter 8 Comparing Quantities, there are 3 exercises with 26 questions. The first exercise of CBSE Class 8 chapter Comparing Quantities is on percentage and ratio. The second exercise is on finding the increase or decrease percent and finding discounts. Through these NCERT solutions for Class 8 Maths chapter 8 Comparing Quantities, students can cover all the problems related to ratios, percentages, discount, profit-loss, and simple-compound interest. Here you will get the detailed NCERT Solutions for Class 8 Maths by clicking on the link.
Profit: Profit = Selling price - Cost price
Loss: Loss = Cost price - Selling price
Profit or Loss Determination:
If SP > CP, then it is a profit.
If SP = CP, then it is neither profit nor loss.
If CP > SP, then it is a loss.
Discount: Discount = Marked Price - Sale Price
Discount Percentage: Discount % = (Discount × 100) / Marked Price
Profit Percentage: Profit Percentage = (Profit / Cost Price) × 100
Loss Percentage: Loss Percentage = (Loss / Cost Price) × 100
Percentage Increased: Percentage Increased = (Change in Value / Original Value) × 100
Simple Interest: Simple Interest = (Principal × Rate × Time) / 100
Compound Interest Formula: Compound Interest = Amount - Principal
Sales Tax or VAT: Sales tax or VAT = (Cost Price × Rate of Sales Tax) / 100
Billing Amount: Billing Amount = Selling price + VAT
Free download NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities for CBSE Exam.
Comparing quantities class 8 NCERT solutions - Topic 8.1
(i)
Using this, answer the following :
(i) How many parents were surveyed?
Let the number of parents surveyed be X.
30% of them helped for hour to hours.
In total, there were 90 such parents.
30% of X = 90
Therefore, there were a total of 300 parents who were surveyed.
(ii)
Using this, answer the following :
(ii) How many said that they did not help?
from the previous question number of parents surveyed X = 300.
Given, 50% did not help.
Therefore, number of parents that did not help = 50% of 300 = 150.
(iii)
to hours. The distribution of parents according to the time for which they said they helped is given in the adjoining figure; 20% helped for more than hours; 30% helped for hour to hours; 50 % did not help at all.
Using this, answer the following :
(iii) How many said that they helped for more than hours?
from the first question number of parents surveyed X = 300
Given, 20% helped for more than hours.
Therefore, number of such parents = 20% of 300 = 2 x 30 = 60.
Class 8 comparing quantities NCERT solutions - Topic 8.3
1(a) A shop gives 20% discount. What would the sale price of each of these be?
(a) A dress marked at Rs 120.
The marked price of dress = Rs120
Discount rate = 20%
Selling price (SP) = Marked price - Total discount = Rs (120- 24) = Rs 96.
1(b) A shop gives 20% discount. What would the sale price of each of these be?
(b) A pair of shoes marked at Rs 750
The marked price of shoes=Rs 750
Discount rate = 20%
Selling price= Marked price- Total discount =Rs (750- 150) = Rs 600.
1(c) A shop gives 20% discount. What would the sale price of each of these be?
(c) A bag marked at Rs 250
The marked price of bag = Rs 250
Discount rate=20%
Selling price = Marked price - Total discount = Rs (250- 50) = Rs 200.
Marked price = Rs 15000
Selling Price = Rs 14400
We know, Discount amount = Marked price - Selling price
Discount amount = Rs 15000-Rs 14400 = Rs 600
Therefore, Discount percentage = 4%
3 An almirah is sold at Rs 5,225 after allowing a discount of 5%. Find its marked price.
Selling price = Rs 5225
Discount percent = 5%
Therefore, the marked price = Rs 5500
NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities Topic 8.4.1
1(a) Find selling price (SP) if a profit of 5% is made on
(a) A cycle of Rs 700 with Rs 50 as overhead charges.
We know, Cost price = Buying price + Overhead expenses
Cost price = Rs 700 + Rs 50 = Rs 750
Profit percent = 5%
We know,
Profit = Rs 37.5
Now, Selling price (SP) = Cost price + Profit =Rs 750 + Rs 37.5 = Rs 787.50
Therefore, the selling price (SP) is Rs 787.50
1(b) Find selling price (SP) if a profit of 5% is made on
(b) a lawnmower bought at Rs 1150 with Rs 50 as transportation charges.
If a profit of 5% is made on a lawnmower bought at Rs 1150 with Rs 50 as transportation charges then selling price is:
1 (c) Find selling price (SP) if a profit of 5% is made on
(c) a fan bought at Rs 560 and expenses of Rs 40 made on its repairs.
We know, Cost price = Buying price + Overhead expenses
Cost price = Rs 560 + Rs 40 = Rs 600
Profit percent = 5%
Profit = Rs 30
Now, Selling price (SP) = Cost price + Profit =Rs 600 + Rs 30 = Rs 630
Therefore, the selling price (SP) is Rs 630
Net profit = Rs 1000 - Rs 1000 = 0
He neither made an overall profit or loss since the profit made on the first tv equals the loss suffered on the second one.
Let the number be x.
Half the number =
= 50 %
Therefore, If we take half the number, the decrease in percent is 50%
Difference between Rs 2400 and Rs 2000 = Rs 2400- Rs 2000 = Rs 400
The per cent by which Rs 2,000 is less than Rs 2,400 is
( Less with respect to 2400. Hence, 2400 will be in the denominator! )
Rs 2000 is less than Rs 2400 by 16.66%
Now,
The per cent by which Rs 2,400 is more than Rs 2,000 is
( More with respect to 2000. Hence, 2000 will be in the denominator! )
Rs 2400 is more than Rs 2000 by 20%
Therefore, they are not the same.
NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities Topic 8.6
Q Find interest and amount to be paid on Rs 15000 at 5% per annum after 2 years.
=Rs1500
Amount to be paid = Interest + Principal Amount
=Rs 15000 + Rs 1500
=Rs 16500
Find the time period and rate for each.
1. A sum taken for years at 8% per annum is compounded half yearly.
Since the sum taken is compounded half yearly:
Time period = 3 half years
Rate = 4% per half year
NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities Topic 8.8
Find the time period and rate for each.
A sum taken for 2 years at 4% per annum compounded half yearly.
Since the sum taken is compounded half yearly:
Time period = 4 half years.
Rate = 2% per half year
Find the amount to be paid
1. At the end of 2 years on Rs. 2,400 at 5% per annum compounded annually.
The amount to be paid at the end of 2 years is Rs 2646
Find the amount to be paid
At the end of 1 year on Rs. 1800 at 8% per annum compounded quarterly.
The Amount to be paid at the end of 4 years is Rs 1948.37
NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities Topic 8.9
1 A machinery worth Rs. 10,500 depreciated by 5%. Find its value after one year.
Price of machinery = Rs. 10,500
Value after one year = Rs 10,500- Rs 525 = Rs 9975
The current population of city
= 12 lakh
1200000
Population after two years =
Thus, the population after two years is 1297920.
Class 8 maths chapter 8 question answer - Exercise 8.1
1 (a) Find the ratio of the following.
Speed of a cycle 15 km per hour to the speed of scooter 30 km per hour.
The ratio of the speed of cycle to the speed of scooter =
= 1:2
1(b) Find the ratio of the following.
5m to 10km
To find the ratio, we need to make both quantities of the same unit.
We know, 1 km = 1000 m.
10 km = 10x1000 m = 10000 m
Therefore the required ratio =
= 1 : 2000
1(c) Find the ratio of the following.
50 paise to Rs. 5
To find the ratio, we first make the quantities of the same unit.
We know, Rs. 1 = 100 paisa. Rs. 5 = 5x100 = 500 paisa
Therefore, the required ratio =
= 1:10
2 (a) Convert the following ratios into percentages.
(a) 3:4
To convert a ratio to a percentage, we multiply the ratio by 100%.
The required percentage of the ratio 3:4 =
2 (b) Convert the following ratios to percentages.
(b)
Answer:
To convert a ratio to a percentage, we multiply the ratio by 100%.
The required percentage of ratio 2:3 =
3 72% of 25 students are interested in mathematics. How many are not interested in mathematics?
Given;
72% of 25 students are interested in mathematics
Percentage of students not interested in mathematics = (100 - 72)% = 28 %
The number of students not interested in mathematics = 28% of 25
Therefore, 7 students (out of 25) are not interested in mathematics.
Given,
Win percentage of the team = 40%
This means that they won 40 matches out of 100 matches played.
They won 10 matches out of = 25 matches played.
Therefore, they played a total of 25 matches in all.
5 If Chameli had Rs 600 left after spending 75% of her money, how much did she have in the beginning?
Let the amount of money Chameli had in the beginning = Rs. X
She spends 75% of the money.
Percentage of money left = (100 - 75)% = 25%
Since she has Rs. 600 left.
25% of X = 600
X =2400
Therefore, Chameli had Rs. 2400 with her in the beginning.
Given,
Total number of people = 50 lakhs
Percentage of people who like cricket = 60%
Percentage of people who like football = 30%
Since remaining people like other games,
Percentage of people who like other games = {100 - (60 + 30) } = (100 - 90) = 10%
10% of the people like other games.
Now,
Number of people who like cricket = 60% of 50 lakhs
Number of people who like football = 30% of 50 lakhs
Number of people who like other games = 10% of 50 lakhs
Class 8 maths chapter 8 NCERT solutions - Exercise 8.2
1 A man got a 10% increase in his salary. If his new salary is Rs 1,54,000, find his original salary.
Given,
Percentage increase in the salary = 10%
Therefore, if the original salary was Rs. 100, the new salary is Rs. 110
If new salary is Rs 1,54,000, the original salary was
Therefore, the original salary was Rs. 14,00,00.
Given,
Number of people who went to the zoo on Sunday = 845
Number of people who went to the zoo on Monday = 169
The decrease in the number of people visiting the zoo = (845 - 169) = 676
Percentage decrease
(Decrease from the original number)
The percent decrease in the people visiting the Zoo is 80%
Given,
Cost price (CP) of the 80 articles = Rs. 2,400
Profit percentage = 16%
Profit amount on all 80 articles = 16% of 2400 = 16/100 x 2400 = Rs. 384
The selling price of the 80 articles = Rs. (2400 + 384) = Rs. 2784
Selling price (SP) of each item = Rs. 2784/80 = Rs. 34.8
Therefore, the selling price of one article is Rs.34.8
Given,
Cost of the article = Rs. 15500
Cost of repair = Rs. 450
Cost price(CP) of the article = Rs. (15500 + 450) = Rs. 15950
Profit percentage = 15%
Profit amount = 15% of Rs.15950 = Rs. 2392.50
Selling Price = Rs.(15950 + 2392.50) = Rs. 18342.50
OR
Selling price (SP) of the article = CP + Profit = CP + (15% of CP)
= 115% of CP
Given,
The cost price of the VCR = Rs. 8000
The cost price of TV = Rs. 8000
Now, He made a loss of 4% on VCR.
Selling price (SP) of the VCR = (100-4)% of CP = 96% x Rs. 8000 = Rs. 7680
Again, He made a profit of 8% on TV.
Selling price (SP) of the TV = (100+8)% of CP = 108% x Rs. 8000 = Rs. 8640
Net Selling price = Rs. (7680 + 8640) = Rs. 16320
Net Cost price = Rs. (2x8000) = Rs. 16000
Since, SP > CP, he made a net profit (gain)
Now, Net Gain = CP - SP = Rs. (16320-16000) = Rs. 320
Gain % = = 2%
The shopkeeper made a gain of 2% on the whole transaction.
Since the 10% discount is on all the items, we can calculate the Selling price by totalling the Cost price of all item bought.
Now,
Total Cost price(CP) of the items he bought = CP of a pair of jeans + CP of two shirts = Rs.(1450 + 850 + 850) = Rs. 3150
The selling price of these items = (100- 10)% of Rs. 3150 = 90% x Rs.3150 = Rs. 2835
The customer has to pay Rs. 2835.
Given,
The milkman sold two of his buffaloes for Rs 20,000 each. This is the Selling price of the buffaloes.
Let CP of one of the buffalo be Rs. X and the other be Rs. Y
Since he made a profit of 5% on one of them.
105% of X = Rs. 20000
X = Rs. 19047.6
Similarly, since he made a loss of 10% on the other.
90% of Y = Rs. 20000
Y = Rs. 22222.2
Net CP = Rs.(19047.6 + 22222.2) = Rs. 41269.8
And net SP = 2 x Rs.20000 = Rs. 40000
Since SP < CP, he made a net loss.
His overall loss = Rs. (41269.8 - 40000) = Rs. 1269.8 = Rs. 1270 (approx)
Given,
Cost price of the TV = Rs. 13000
Sales tax at the rate of 12%
Selling price = CP + Sales Tax = CP + 12% of CP
= 112% of CP =
Vinod will have to pay Rs. 14,560.
The discount given was 20% which means if CP is Rs. 100 then the SP is Rs. 80
If SP is Rs. 80 then CP is Rs. 100
For SP of Rs. 1600, CP
The marked price is Rs. 2000.
10 I purchased a hair-dryer for Rs 5,400 including 8% VAT. Find the price before VAT was added.
Given,
VAT = 8%
Let the original price be Rs. 100
Original price + VAT = Rs. 100 + Rs.
Original price + VAT = Rs. 100 + Rs. 8 = Rs. 108
If the price after VAT is Rs.5400, then the price before VAT is
The price before VAT was added is Rs. 5000.
Given,
GST = 18%
Cost with GST included = Rs. 1239
Cost without GST = x Rs.
cost before GST+ GST = cost with GST
x = 1050
Price before GST = 1050 rupees
NCERT Solutions for Class 8 Maths Chapter 8 Comparing Quantities Exercise 8.3
1 (a) Calculate the amount and compound interest on
(a) Rs 10,800 for 3 years at % per annum compounded annually .
Given,
Principal,P = Rs 10800
Compound Interese Rate,R = p.a.
Time period,n = 3 years.
We know,
Amount when interest is compounded annually, A =
Therefore, the required amount = = Rs. 15377.34
And Compound Interest, CI = Amount - Principal = Rs. (15377.34 - 10800) = Rs. 4577.34
1 (b) Calculate the amount and compound interest on
(b) Rs 18,000 for years at 10% per annum compounded annually .
Given,
Principal,P =Rs.18000, Rate,R = 10% and time period,n = 2.5 years.
We know, Amount when interest is compounded annually =
Amount after 2 years at 10% , A = = Rs.21780
This acts as the principal amount for the next half year.
SI on next 1/2 year at = = Rs. 1089
Therefore, Total amount to be paid after 2.5 years = Rs. (21780+1089) = Rs.22869
Now, Compound Interest after 2 years = A - P = Rs.(21780-18000) = Rs. 3780
Therefore, Compound Interest after 2.5 years, CI = Rs. 3780 + SI = Rs.4869
Q: 1 (c) Calculate the amount and compound interest on
(c) Rs 62,500 for years at 8% per annum compounded half yearly.
Given,
Principal,P =Rs 62500,
Compound interest Rate,R = 8% compounded half yearly for 1.5 years.
Since it is compounded half yearly, R becomes half = 4%, and time period doubles, n = 3 years.
We know, Amount when interest is compounded annually, A =
Therefore, the required amount = = Rs.70304
And Compound Interest, CI = Amount - Principal = Rs. (70304 - 62500) = Rs. 7804
1 (d) Calculate the amount and compound interest on:
(d) Rs 8000 for 1 year at 9% per annum compounded half yearly. (You could use the year by year calculation using SI formula to verify)
Given,
Principal,P =Rs.8000, Rate, R = 9% per annum compounded half yearly for 1 year.
Now, there are two half years in a year. Therefore compounding has to be 2 times.
And rate = half of 9% = 4.5% half yearly.
Therefore, the required amount = = Rs. 8736.20
And Compound Interest, CI = Amount - Principal = Rs. (8736.20 - 8000) = Rs. 736.20
1 (e) Calculate the amount and compound interest on
Rs 10,000 for 1 year at 8% per annum compounded half yearly.
Given,
Principal, P =Rs.10000, Rate, R = 8% per annum compounded half yearly for 1 year.
Now, there are two half years in a year. Therefore compounding has to be 2 times.
And rate = half of 10% = 5% half yearly.
Therefore, the required amount = = Rs. 10816
And Compound Interest, C.I. = Amount - Principal = Rs. (10816 - 10000) = Rs. 816 .
The amount borrowed from the bank = Principal amount, P = Rs 26400
Compound interest rate, R = 15% p.a.
Time period = 2 years 4 months =
We know, Amount when interest is compounded annually, A =
Therefore, for the first 2 years, amount, A = = Rs 34914
Now, this would act as principal for the next 1/3 year. We find the SI on Rs 34914 for 1/3 year.
SI = = Rs 1745.70
Therefore, Required amount at the end of 2 years and 4 months = A + SI = Rs (34914 + 1745.70) = Rs 36659.70
For Fabina,
Principal,P =Rs 12500
Simple interest Rate,R = 12% p.a.
Time period,n = 3 years.
Simple Interest, SI at 12% for 3 years = = Rs 4500
For Radha,
Principal,P =Rs 12500
Compound interest Rate,R = 10% p.a.
Time period,n = 3 years.
We know, Amount when interest is compounded annually,
Fabina pays more interest and Rs (4500 - 4137.50) = Rs 362.50 more.
Given,
Principal,P =Rs 12000
Simple interest Rate,R = 6% p.a.
Time period,n = 2 years.
Simple Interest, SI at 6% for 2 years =
If he would have borrowed it at a compound interest rate, R = 6% p.a.
We know, Amount when interest is compounded annually, A =
He would have to pay Rs (1483.20 - 1440) = Rs 43.20 extra.
(i) after 6 months?
Given,
Principal, P = Rs 60,000
Compound interest rate, R = 12% p.a
= 6 % half yearly
For a period of 6 months. Time period, n = 1 half year (As there is 1 half year in 6 months.)
We know, Amount when interest is compounded annually, A =
After 6 months, Vasudevan would get an amount Rs. 63600.
(ii) after 1 year?
Given,
Principal, P = Rs 60,000
Compound interest rate, R = 12% p.a
= 6 % half-yearly
For a period of 1 year. Time period, n = 2 half years (As there are 2 half years in a year.)
We know, Amount when interest is compounded annually, A =
After 1 year, Vasudevan would get an amount Rs. 67416.
(i) compounded annually.
(ii) compounded half yearly.
(i) Given,
Principal amount, P = Rs 80000
Rate of interest, R = 10% p.a.
Time period = years.
We know, Amount when interest is compounded annually, A =
Now, For the first year, A=
For the next half-year, this will act as the principal amount.
Interest for 1/2 year at 10% p.a =
Required total amount = Rs (88000 + 4400) = Rs 92400
(ii) If it is compounded half-yearly, then there are 3 half years in years.
n = 3 half years.
And, Rate of interest = half of 10% p.a = 5% half yearly
The difference in the two amounts = Rs (92610 - 92400) = Rs 210
(i) The amount credited against her name at the end of the second year.
Given,
Principal amount, P = Rs 8,000
Compound rate of interest, R = 5% p.a.
Time period, n = 2 years
We know, Amount when interest is compounded annually,
Therefore, the amount credited against her name at the end of the second year is Rs 8,820
(ii) The interest for the 3rd year.
Now, the amount after 2nd year will become the principal amount for the 3rd year
Principal amount, P = Rs 8,820
Compound rate of interest, R = 5% p.a.
Time period, n' = 1 year
Therefore, the interest for the 3rd year is Rs 441.
Principal = Rs.10,000
Time = years
Rate = 10% per annum
CASE 1 Interest on compounded half yearly.
Rate = 10% per annum = 5 % per half yearly
= Amount
CI = Amount - principal
CI =
CI = 1576.25
CASE 2 Interest on compounded anually
Rate = 10% per annum
= Amount
CI = Amount - principal
CI =
CI = 1000
Interest for half years on 11000 =
= 550
Total interest =
= RS 1550
Since 1576.25 1000
Thus, interest would be more in CASE 1 i.e. compounded half yearly
Given,
Principal amount, P = Rs 4,096
Rate of interest, R
Time period, n = 18 months = (12 + 6) months = 1.5 years = 3 half years
(There are 3 half years in 1.5 years)
We know,
Amount when interest is compounded annually, (A)
Therefore, the required amount
Ram will get Rs 4,913 after 18 months.
10 The population of a place increased to 54,000 in 2003 at a rate of 5% per annum
(i) find the population in 2001.
Let the population in 2001 be P
Compound rate of increase = 5% p.a.
The population in 2003 will be more than in 2001
Time period, n = 2 years (2001 to 2003)
Therefore, the population in 2001 was 48980 (approx)
10 The population of a place increased to 54,000 in 2003 at a rate of 5% per annum.
(ii) what would be its population in 2005?
Let the population in 2001 be P'
Compound rate of increase = 5% p.a.
The population in 2005 will be more than in 2003
Time period, n = 2 years (2003 to 2005)
Therefore, the population in 2005 will be 59535 (approx)
Given,
Initial count of bacteria, P = 5, 06,000 (Principal Amount)
Rate of increase, R = 2.5% per hour.
Time period, n = 2 hours
(This question is done in a similar manner as compound interest)
Number of bacteria after 2 hours =
Therefore, the number of bacteria at the end of 2 hours will be 531616 (approx)
Given,
Principal = Rs 42,000
Rate of depreciation = 8% p.a
Reduction = 8% of Rs 42000 per year
Value at the end of 1 year = Rs (42000 – 3360) = Rs 38,640
Chapter -1 | |
Chapter -2 | |
Chapter-3 | |
Chapter-4 | |
Chapter-5 | |
Chapter-6 | |
Chapter-7 | |
Chapter-8 | Comparing Quantities |
Chapter-9 | |
Chapter-10 | |
Chapter-11 | |
Chapter-12 | |
Chapter-13 | |
Chapter-14 | |
Chapter-15 | |
Chapter-16 |
Complete Coverage: Solutions for maths chapter 8 class 8 cover all topics and concepts related to comparing quantities as per the Class 8 syllabus.
Step-by-Step Solutions: Detailed, step-by-step explanations for each problem, making it easy for students to understand and apply mathematical concepts related to ratios, percentages, and discounts.
Illustrations and Diagrams: The inclusion of diagrams, figures, and illustrations to visually explain concepts and methods for comparing quantities ch 8 maths class 8.
Also Check NCERT Books and NCERT Syllabus here:
Increase or decrease percentage, discounts, profit and loss, simple and compound interest are the important topics of this chapter.
CBSE class 8 maths is damn simple and basic. Most of the chapters are related to the previous classes.
NCERT solutions are helpful for the students if they are not able to NCERT problems on their own. These solutions are provided in a very detailed manner which will give them conceptual clarity.
There are 16 chapters starting from rational number to playing with numbers in the CBSE class 8 maths.
Here you will get the detailed NCERT solutions for class 8 by clicking on the link.
Here you will get the detailed NCERT solutions for class 8 maths by clicking on the link.
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