Question

a number is decreased by 20% and then increased by 20% find the net increase or decrease percent

Answer 1

Let Number be 100

ATQ,
         Ist Condition  100 +  100*20/100 = 120

IInd condition 120 - 120*20/100 = 120-24 = 96

so, Overall Number is decreased by 4%

Answer 2

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• Let the Number be 100.

➟ 100 × (100 + 20)% × (100 - 20)%

➟ 100 × 120% × 80%

➟ 100 × $\large\tt{\frac{120}{100}}$ × $\large\tt{\frac{80}{100}}$

➟ 100 × $\large\tt{\frac{12}{10}}$× $\large\tt{\frac{8}{10}}$

➟ 1 × 12 × 8

➟ 96%