Question

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

Answer 1

Let the number be x.

x is increased by 10%

x+10x/100

=110x/100

=11x/10

11x/10 is decreased by 10%

11x/10-10/100*11x/10

=11x/10-11x/100

=110x-11x/100

=99x/100

decrease=x-99x/100

=x/100

Percentage=x/100/x*100%

=100/100=1%

Hope it helps.

Answer 2

let us take the number as 20
20+10%=20+2=22
22-10%=22-2.2=19.8
decrease percentage=0.2/100=0.002%