Question
Quantity I: The price of rice is decreased by 30%, by
how much % the consumption is increase so that the expenditure will decreased by 10%? Quantity II: A man spends Rs. 45,600 out of his income 68,400. If his income and expenditure are increased by 19% and 13%. Find the percentage change in his savings.Solution
Quantity I: Let expenditure = 100    Price = 70    New expenditure = 90 ∴ Required % = (90-70)/70 × 100 = 28*4/7 % 
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