Questions and Solutions for NCERT Class 7th Mathematics – Chapter 8 – Comparing Quantities – Exercise – 8.3
1. Tell what is the profit or loss in the following transactions. Also find profit per cent or loss per cent in each case.
(a) Gardening shears bought for Rs 250 and sold for Rs 325.
(b) A refrigerater bought for Rs 12,000 and sold at Rs 13,500.
(c) A cupboard bought for Rs 2,500 and sold at Rs 3,000.
(d) A skirt bought for Rs 250 and sold at Rs 150.
2. Convert each part of the ratio to percentage:
(a) 3:1 (b) 2:3:5 (c) 1:4 (d) 1:2:5
3. The population of a city decreased from 25,000 to 24,500. Find the percentage decrease.
4. Arun bought a car for Rs 3,50,000. The next year, the price went upto Rs 3,70,000. What was the Percentage of price increase?
5. I buy a T.V. for Rs 10,000 and sell it at a profit of 20%. How much money do I get for it?
6. Juhi sells a washing machine for Rs 13,500. She loses 20% in the bargain. What was the price at which she bought it?
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, carbon is 3g, what is the weight of the chalk stick?
8. Amina buys a book for Rs 275 and sells it at a loss of 15%. How much does she sell it for?
9. Find the amount to be paid at the end of 3 years in each case:
(a) Principal = Rs 1,200 at 12% p.a. (b) Principal = Rs 7,500 at 5% p.a.
10. What rate gives Rs 280 as interest on a sum of Rs 56,000 in 2 years?
11. If Meena gives an interest of Rs 45 for one year at 9% rate p.a.. What is the sum she has borrowed?
You can find the solutions for previous exercise from here
- Chapter – 8 – Comparing Quantities – Exercise – 8.2
- Comparing Quantities – Exercise – 8.1
- Congruence of Triangles – Exercise – 7.2
- Chapter 7 – Congruence of Triangles – Exercise – 7.1
- The Triangle and its properties – Exercise 6.5
- Chapter 6 – The Triangle and its properties – Exercise 6.4
- Class 7th Maths – Exercise 6.3 Solutions
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