Question

A number is first increased by 20℅ and the resulting number is then decreased by 10℅ .find the overall change in the number as percent

Answer 1

Let the number be x

x+20% = x-10%
x+20/100 = x-10/100
x+1/5 = x-1/10
x+x = 1/10-1/5
2x = 1/10-2/10
2x = 1/10
x= 1/10×2
x= 1/20 Ans