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    Question

    If the difference between the simple interest and

    compound interest, compounded annually, on Rs. 40,000 at (r + 4)% rate of interest for 2 years is Rs. 256, find the time to double an investment at (r + 6)% p.a. simple interest.
    A 25 yrs Correct Answer Incorrect Answer
    B 10 yrs Correct Answer Incorrect Answer
    C 12 yrs Correct Answer Incorrect Answer
    D 15 yrs Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, For doubling the amount at = (r+6) = 10% 10t = 100 t = 10 yrs

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