Question

a number is increased by 20% and then it is decreased by 20 %. find the net increase or decrease per cent

Answer 1

let number be x
increased number =120%of x =120/100x=6x/5
then decreased number=80%of 6x/5
=6x/5×80/100
net decrease=x-24x/25= x/25
net percentage =x/25×1/x×100%=4%