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    Question

    Due to a 20% increase in book prices, Riya decided to

    buy 25% less books. Find out the percentage change in her book expenses.
    A 10% increase Correct Answer Incorrect Answer
    B 10% decrease Correct Answer Incorrect Answer
    C 5% increase Correct Answer Incorrect Answer
    D 0% change Correct Answer Incorrect Answer

    Solution

    Let the initial price of a book be Rs. 100p and initial quantity be 100q books. Initial expenditure = 100p ├Ч 100q = Rs. 10000pq New expenditure = (1.20 ├Ч 100p) ├Ч (0.75 ├Ч 100q) = Rs. 9000pq Required percent change = [(9000pq - 10000pq) ├╖ 10000pq] ├Ч 100 = -10% decrease

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