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A number is increased by and then decreased by , find the net increase or decrease per cent.

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answer is B.

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Detailed Solution

Concept- To solve this question, first we will assume that the number be 100 , and according to the question, we will first increase the number by

, then we will decrease the number by

. Then after that we will find whether we get a net increase or decrease per cent.
We have been given that a number is increased by

and then decreased by

, we need to find the net increase or decrease per cent.
First of all, we will assume the number. So, let the number be 100 .
We have been given in the question that firstly, the number is increased by

Then, we have been given in the question that secondly, the number is decreased by

=99
On putting the values in the above formula, we get
Net increase or decrease percentage

So, we get the net decrease, which is

.
Hence, the correct option is 2.

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