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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-5

  • question_answer
    At what rate per cent of simple interest will a sum of money double itself in 12yr?

    A)  \[8\frac{1}{3}%\]         

    B)  \[8\frac{1}{2}%\]

    C)  \[8\frac{1}{4}%\]         

    D)   \[9\frac{1}{2}%\]

    Correct Answer: A

    Solution :

    Let the sum = Rs. P \[\therefore \,\,\] Amount = Rs. 2P \[\Rightarrow \,\]Sl =Rs. P \[\therefore \,\,\]  \[P=\frac{P\times r\times 12}{100}\] \[\Rightarrow \]   \[r=\frac{100}{12}=8\frac{1}{3}%\]


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