Question

if the price of the book is first decrease d by 25% and then increased by 20%then the net chang in the price will be​

Answer 1

let the price of the book is 100x
first price decreases 25%
$100x - 25\% \\ 100x - 25x \\ 75x$
than increases 20%
$75x + 20\% \\ 75x + 15x \\ 90x$
Net change = 100x-90x
= 10x

Answer 2

Given:

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

To find:

The net change in the price will be?

Solution:

Let the price of the book is 100

First, decreased by 25%

=> 100 x 25/100 = 25

=> 100 - 25

=> 75

Then, increased by 20%

=> 75 x 20/100 = 15

=> 75 + 15

=> 90

Net change is => 100 - 90 = 10

Hence, The net change in the price will be a 10% decrease.