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    Question

    If a certain sum becomes 5 times of itself in 2 years

    when invested at certain rate (per annum) of simple interest, then find the rate of interest.
    A 100% p.a. Correct Answer Incorrect Answer
    B 250% p.a. Correct Answer Incorrect Answer
    C 200% p.a. Correct Answer Incorrect Answer
    D 400% p.a. Correct Answer Incorrect Answer

    Solution

    Let the sum invested be Rs. 'x' and rate of interest be r% p.a. Therefore, amount received = Rs. 5x Interest received = 5x - x = Rs. 4x Therefore, {(x X 2 X r)/100} = 4x Or, r = 200 Therefore, required rate of interest = 200% p.a.

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