Question

a number is first increased by 20% and then decrease by 15% find the increase or decrease in the percentage on whole ​

Answer 1

Solution :-

Let the required number be 100

Now, according to the question.

The number is first increased by 20 %

⇒ 100 + 20 % of 100

⇒ 100 + [(20*100)/100]

⇒ 100 + 20

⇒ 120

Then, it is decreased by 15 %

⇒ 120 - (15 % of 120)

⇒ 120 - [(15*120)/100]

⇒ 120 - 18

= 102

Net increase = 102 - 100

= 2

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Percent increase = (Change in number*100)/100

⇒ (2*100)/100

= 2 %

Hence, the increase percent is 2 %.

Answer

Answer 2

Answer:

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