Question

If the price of a book is first decreased by 25% and then increased by 20%.

What is the net change in the price?

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Answer 1

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Let the original price of the book be Rs. 100.

Decreased price of the book = Rs. 75

Increased price of the book after 20% increase

$= \frac{120}{100} \times 75$

$= 90$

$so \: net \: change \: in \: price = 10\% \: decrease \:$

$\% \: change = \frac{10}{100} = 10\%$