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    Question

    The difference between compound interest and simple

    interest at the same rate for Rs. 3200 for 2 years is Rs. 128. The rate of interest per annum is:
    A 25% Correct Answer Incorrect Answer
    B 10% Correct Answer Incorrect Answer
    C 32% Correct Answer Incorrect Answer
    D 20% Correct Answer Incorrect Answer

    Solution

    When difference is given between SI and CI for 2 years, then the formula is: CI – SI = P (R/100)2  According to the question, => 128 = 3200 (R/100)2 => R2 = (128 × 10000)/3200 => R = 20%

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