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    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?
    A 10% increase Correct Answer Incorrect Answer
    B 12% decrease Correct Answer Incorrect Answer
    C 16% decrease Correct Answer Incorrect Answer
    D 18% increase Correct Answer Incorrect Answer

    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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