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    Question

    A sum of money placed at simple interest becomes Rs. 14,400

    in 4 years and Rs. 18,000 in 7 years. What is the initial amount invested?
    A Rs. 5,650 Correct Answer Incorrect Answer
    B Rs. 9,600 Correct Answer Incorrect Answer
    C Rs. 3,600 Correct Answer Incorrect Answer
    D Rs. 6,150 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Interest earned in 3 years = 18,000 - 14,400 = Rs. 3,600

    Interest earned in 4 years = (3,600 / 3) Ă— 4 = Rs. 4,800

    So, amount invested = 14,400 - 4,800 = Rs. 9,600

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