# NCERT Class 7 Mathematics Solutions: Chapter 8 –Comparing Quantities Exercise 8.3 Part 5

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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