Question
A college student spends 75% of his pocket money. When
the pocket money increased by 20%, the expenditure also increased by 15%. What is the increase in the savings?Solution
Let the pocket money =100 Spends =75% Saving =100-75=25 20% increase in pocket money =120 And 15% increase in expenditure =75×115/100 =86.25 Saving =120-86.25 =33.75. Increasing in saving =33.75-25=8.75 Percent =8.75/25 ×100 =35%
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15 × 20 + 30 ÷ 10 – 12 = 163
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