A number is increased by 10%and then it is decreased by 10%. What is the net change in the number.

The ans is
Let the no. be 100
When increased by 10%this becomes 110
Now there is a decrease of 10%in the increased no.,i.e.,110.
This decrease =10?100?110 = 11
The no. Becomes = 110 -11=99
Hence Net change =original no. - final no.
= 100 - 99 = 1
Net change % = (1?100 ? 100)% = 1% (decrease)