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    Question

    The price of kerosene increases by 20% and then by a

    further (20/3) % . Find the percentage by which the consumption of kerosene must be reduced so that expenditure on kerosene remains the same.
    A 23.750% Correct Answer Incorrect Answer
    B 21.875% Correct Answer Incorrect Answer
    C 19.950% Correct Answer Incorrect Answer
    D 20.405% Correct Answer Incorrect Answer

    Solution

    Let the original price of kerosene be Rs. '100x' Then, increased price of kerosene = 100x X (120/100) X (320/300) = Rs. '128x' So, percentage by which consumption must be reduced = 100 - (100x/128x) X 100 = 100 - 78.125 = 21.875%

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