Question

the price of an article is increased by 25%. By how much per cent must this new value be decreased
to restore it to its former value!​

Answer 1

Answer:

let original price be x

if price is increased by 25% then

new price =1.25*x

let new price be decreased by y percent so as to restore original price

1.25*x-1.25*x*y÷100=x

1.25*x*(1-y÷100)=x

1-y÷100=1÷1.25

y=(1-1÷1.25)*100

y=20percent