Question

A number is first decreased by 20% and then the new number is obtained is decreased by 20%.find the net increase and decrease percent.please answer the question

Answer 1

hello,
let the no. be x
it is decreased by 20%
x-20%of x
x-20x/100
x-x/5
=4x/5
now it is again decreased by 20%
4x/5-20%of 4x/5
=16x/25
now it is decreased as it less than x
%=(actual - decreased)/actual×100
(x-16x/25)x×100
9x/25/x×100
=9/25×100
=36% decreased
ence the new no. will be decreased by 36%
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