Question

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

Answer 1

let the no. = 100
first increased by 20℅
=100+ 20℅ of 100
= 120 Rs

then decreased by 15℅
= 120- 15℅of 120
= 102 Rs

net increase = initial value- final value
= 102-100
= 2 Rs

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%

2% increase