Question

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

Answer 1

20%=1/5

15%=3/20

5 6
20 17

5aur 20 ka aur 6aur 17 ka multiply karne par
100 102
2 increase hua

ab percentage =2/100×100
= 2% increase

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%