Question

If the cost of a notebook worth Rs. 40 is

increased by Rs. 20 the rate of increase is 25%​

Answer 1

Step-by-step explanation:

If the price of a book is first decreased by 25% and then increased by 20%, then the net change in the price will be?

Let the price of the book is 100%.

First time the price of the book is decreasing by 25%.

When the price of the book decreases by 25%, it remains (100–25)= 75% of original.

New price of book = 75%.

And after that the price of book is increasing by 20%.

when the price of the book increases by 20%, it becomes 120% of original or 75*120/100= 90%

So overall there will be a decrease of 10%.

Answer 2

Step-by-step explanation:

Let us assume the price of product be 100rs

increase in price is 20% hence new price is 20% of 100 =20 so new price would be 100+20=120.

Afterward there is a decrease of 30 % in price from 120 rs, hence 30% of 120 is 36 so new price would be 120–36 = 84.

So the overall %change is 16% as the initial price was 100 and new price is 84