Question

A number is increased by 20 and then its is decreased by 10.find the net increase or decrease per cent

Answer 1

let the number be x
it increased by 20%
it becomes X + 20% of X equal to 6x/5
it decreased by 10%
it becomes 6 x/5 -10% of 6x/5=54x/50
net increase equal to 4x/50
required percentage equal to( 4×/50 )×100%/x
=8%