Question

a number is increased by 10% and then decreased by 10% find the net increase or decrease percent

Answer 1

The net increase / decrease percent is zero....
This is because it is increased by 10% and decreased by 10%.

Hope it helped....
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- Maheshwaran.

Answer 2

Let
Number =100

Increase by, 10%

=100+10
=110

Now it decreases by 10%

Decrease =11

=110-11

=99

Net decrease =100-99

=1

Decrease %= decrease / initial value x100

=1/100 x100

=1%

Shortcut

When this kind of condition given something first increased and then decrease with same %

We also get decrease %

Use this

$( \frac{x}{10} )^{2}$
Where x= increase or decrease %

By this method

$( \frac{10}{10} )^{2}$
=1²=1% decrease

This is ur ans hope it will help, in case of any doubt comment below