New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    How long will a sum of money take to double, if it is

    invested in 9% p.a. simple interest?(approx).
    A 12 years Correct Answer Incorrect Answer
    B 14 years Correct Answer Incorrect Answer
    C 11 years Correct Answer Incorrect Answer
    D 13 years Correct Answer Incorrect Answer

    Solution

    Rate =9% Let Principle =100 Amount =100×2=200 SI =A-P=200-100=100. T =SI ×100)/PR = (100×100) / 100×9 =10000/900 =11(1/9) years

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