Question
Neha cut down her milk consumption by 30% due to a 20% hike
in its price. What is the percentage change in her total milk expenditure?Solution
ATQ,
Let the initial price of milk be Rs. 100a and initial consumption be 100b litres
Initial expenditure = 100a × 100b = Rs. 10000ab
New expenditure = (1.20 × 100a) × (0.70 × 100b) = Rs. 8400ab
Required percent = [(8400ab - 10000ab) ÷ 10000ab] × 100 = -16% decrease
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