Question

A number is increased by 20%and then decrased by 20%.find the net decrase per cent

Answer 1

Answer:

Step-by-step explanation:

Let the no be n and net decrease percent be r

No is increased by 20℅

n+n*20/100

n+n/50

51n/50

Then it is decreased by 20℅

51n/50-51n/100

102n-51n/100

51n/100

So net decrease

n*r/100-n=51/100