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    Question

    A sum of money becomes four times of itself in 12 years.

    Find the rate percent per annum.
    A 15% Correct Answer Incorrect Answer
    B 20% Correct Answer Incorrect Answer
    C 25% Correct Answer Incorrect Answer
    D 30% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the sum = Rs. 100 then amount = Rs. 400 then S.I = Rs. 300 = PRT/100 or rate of interest(R) = 300 ×100 /(P×T) = 300 × 100 / ( 100 × 12) = 25%

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