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    Question

    What is the ratio of the simple interest earned on a

    certain amount at the rate of 21% per annum for 8 years to that earned on the same sum at the same rate for 42 years?
    A 4:21 Correct Answer Incorrect Answer
    B 5:22 Correct Answer Incorrect Answer
    C 22:5 Correct Answer Incorrect Answer
    D 4:11 Correct Answer Incorrect Answer

    Solution

    Let the principal amount =100 Interest at the rate of 21% for 8 years = (100×21×8)/100=168Rs. At the same amount and rate –but time 42 years. Simple interest = (100×42×21)/100=882Rs. Ratio =168:882=4:21

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