Question

The strength of a number is
increased by 20 percent in
One year and decreased by
twenty percent in the
next year. Is the final
strength greater or less
than the original one and
by how much percent?​

Answer 1

Answer:

Let the number be 100 %

It is given that first the number is increased by 20 %

Hence, 20 % of 100 % = (20/100) x (100/100)

                                    = 20/100

                                    = 20 %

So, increase in number = 100 % + 20 %

                                     = 120 %

Also given that the number is decreased by 20 %

Hence, 20 % of 120 % = (20/100) x (120/100)

                                    = 24/100

                                    = 24 %

So, decrease in number = 120 % - 24 %

                                      = 96 %

which shows that the net decrease in percent of the original number is 96%.

Hope it will help you.

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Explanation: