NCERT Class 7 Mathematics Solutions: Chapter 8 – Comparing Quantities Exercise 8.3 Part 5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Understanding of Profit and Loss and Its Formula

1. Amina buys a book for and sells it at a loss of . How much does she sell it for?

Answer:

The cost of a book

Loss percent

Loss Loss of C. P

So,

So, Amina sells books for

2. Find the amount to be paid at the end of years in each case:

(a) Principal .

(b) Principal

Answer:

(a) Principal (P) ,

Rate p. a. ,

Time years

Simple Interest

Now,

Amount

(b) Principal (P) ,

Rate (R) p. a. ,

Time (T) years

Simple Interest

Now,

Amount