Question

7. A number is decreased by 20% and then increased by 20%. Find
the net increase or decrease percent​

Answer 1

Answer:

decrease of 4%

Step-by-step explanation:

let the number = 100

first it is decreased by 20%

20% of 100 =20

so the number becomes 80

then it is increased by 20%

so 20% of 80 = 16

so the number becomes 96

first the number was 100 now it became 96 so a decrease of 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%