Question

a bookshop owner purchase 100 notebook for $15 each. however,5 notebooks had to be thrown away as a few pages were torn form them. the remainining notebook were sold at $18 each. find the gain or loss per cent

Answer 1

CP of 1 notebook = $15
CP of 100 notebooks = $15*100 = $1500.

5 Books thrown away,
Remaining books = 100-5 = 95 Notebooks.

SP of 1 notebook = $18
SP of 95 Notebooks = $18*95 = $1710.

Profit = SP - CP
= 1710-1500
= $210

Profit% =>

$\frac{profit}{cp} \times 100 \\ = \frac{210}{1500} \times 100 \\ = \frac{210}{15} \\ = 14\%$

Profit % = 14%

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