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    Question

    The simple interest on a sum of money is four times the

    principal. The rate per cent per annum and time in years are equal. Find the rate per cent per annum.
    A 10% Correct Answer Incorrect Answer
    B 12% Correct Answer Incorrect Answer
    C 15% Correct Answer Incorrect Answer
    D 20% Correct Answer Incorrect Answer

    Solution

    Let Principal =P SI =4P Rate=time=r SI =Prt/100 4P=P×r×r/100 Pr2/100 =4P r2=400 r=20%

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