Question

A number is first increased by 20% and then decreased by 15%. find the net increase or decrease percent.

Answer 1

suppose we take a number 100
So 20%increase = 120/100 * 100 = 120
And now decrease by 15% = 120 - 15/100* 120= 102
Thus there Is a gain percent is 2%

Answer 2

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• Let the Number be 100.

➟ 100 × (100 + 20)% × (100 - 15)%

➟ 100 × 120% × 85%

➟ 100 × $\large\tt{\frac{120}{100}}$ × $\large\tt{\frac{85}{100}}$

➟ 100 × $\large\tt{\frac{12}{10}}$× $\large\tt{\frac{17}{20}}$

➟ 10 × 12 × $\large\tt{\frac{17}{20}}$

➟ 102%