NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.3

Class 7 Maths NCERT Solutions Chapter 8 Comparing Quantities Ex 8.3

Ex 8.3 Class 7 Maths Question 1.
Tell what is the profit or loss in the following transactions. Also, find profit percent or loss percent in each case.
(a) Gardening shears bought for ₹ 250 and sold for ₹ 325.
(b) A refrigerator bought for ₹ 12,000 and sold at ₹ 13,500.
(c) A cupboard bought for ₹ 2,500 and sold at ₹ 3,000.
(d) A skirt bought for ₹ 250 and sold at ₹ 150.
Solution:

Ex 8.3 Class 7 Maths Question 2.
Convert each part of the ratio to percentage:
(a) 3 : 1
(b) 2 : 3 : 5
(c) 1 : 4
(d) 1 : 2 : 5
Solution:

Ex 8.3 Class 7 Maths Question 3.
The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.
Solution:
The original population of the city = 25000
The decreased population of the city = 24500
∴ Decrease in population = 25000 – 24500 = 500
∴ Percentage of decrease = ( \(\frac { 500 }{ 25000 } \) × 100 ) % = 2%

Ex 8.3 Class 7 Maths Question 4.
Arun bought a car for ₹ 3,50,000. The next year, the price went up to ₹ 3,70,000. What was the percentage of the price increase?
Solution:
Original cost of the car = ₹ 3,50,000
Increased cost of the car = ₹ 3,70,000
∴ Increase in price = ₹ (370000 – 350000) = ₹ 20,000
∴ Percentage increase = ( \(\frac { 20000 }{ 350000 } \) × 100 )% = \(\frac { 40 }{ 7 } \) % = 5 \(\frac { 5 }{ 7 } \)%

Ex 8.3 Class 7 Maths Question 5.
I buy a T.V. for ₹ 10,000 and sell it at a profit of 20%. How much money do I get for it?
Solution:

Ex 8.3 Class 7 Maths Question 6.
Does Juhi sell a washing machine? 13,500. She loses 20% in the bargain. What was the price at which she bought it?
Solution:
We have, S.P. = ₹13,500 and loss = 20%.

Ex 8.3 Class 7 Maths Question 7.
(i) Chalk contains calcium, carbon, and oxygen in the ratio 10:3:12. Find the percentage of carbon in chalk.
(ii) If in a stick of chalk, the carbon in 3g, what is the weight of the chalk stick?
Solution:

Ex 8.3 Class 7 Maths Question 8.
Amina buys a book for ₹ 275 and sells it at a loss of 15%. How much does she sell it for?
Solution:

Ex 8.3 Class 7 Maths Question 9.
Find the amount to be paid at the end of 3 years in each case :
(a) Principal = ₹ 1,200 at 12% p.a.
(b) Principal = ₹ 7,500 at 5% p.a.
Solution:

Ex 8.3 Class 7 Maths Question 10.
What rate gives ₹ 280 as interest on a sum of ₹ 56,000 in 2 years?
Solution:

Ex 8.3 Class 7 Maths Question 11.
If Meena gives an interest of ₹ 45 for one year at a 9% rate p.a. What is the sum she has borrowed?
Solution:

We hope the NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities help you. If you have any query regarding NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities, drop a comment below and we will get back to you at the earliest.