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 21 years?
    A 8:21 Correct Answer Incorrect Answer
    B 21:5 Correct Answer Incorrect Answer
    C 5:21 Correct Answer Incorrect Answer
    D 21:8 Correct Answer Incorrect Answer

    Solution

    ATQ, Simple interest = [(P × T × R)/100] Ratio of simple interest earned on certain amount at the rate of 21% p.a for 8 years and that for 21 years  = (P × 8 × 21)/100 : (P × 21 × 21)/100  = 168 : 441  = 24:63  = 8 : 21

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