CBSE students can refer to NCERT Solutions for Class 7 Maths Chapter 8 Comparing Quantities Ex 8.3 Textbook Questions and Answers are provided by experts in order to help students secure good marks in exams.

## 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:
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**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:
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**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:
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**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:
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**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:
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**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:
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**Ex 8.3 Class 7 Maths Question 10.**

What rate gives ₹ 280 as interest on a sum of ₹ 56,000 in 2 years?

**Solution:
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**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:
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