Question

A number is increased by 20% and then it is decreased by 10%. Find the net
increase or decrease per cent.
​

Answer 1

Answer:

80%

Step-by-step explanation:

Let the number be k

If increased by 20% = 120 % of k

= 120/100 x k

= 6k/5

If decreased by 10% = 90% of 6k/5

= 90/100 x 6k/5

= 27k/15

So the number is increased

Oringinal value is k and the resulted value is 9k/5

To find increase % = Final value - Initial value / Initial value x 100

=========>>>>>> 9k/5-k / k x 100

=========>>>>>> 4/5 x 100 ===>>> 80%

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