Question

the salary of a worker is first increased by 10% and then decreased by 20% what is the percentage effect in his salary​

Answer 1

Suppose intially he had ₹100 so increase by 10% = 110

Then decrease by 10 %= 110–11= 99

Hence reduced by 1%

Direct formula

If something increased by x% and reduced by x% then net effect will be loss of (x/10)^2%