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SSC Sample Paper SSC CGL - Sample Paper-3

  • question_answer
    A certain sum of money becomes three times of itself in 20 yr at simple interest. In how many years does it become double of itself at the same rate of simple interest?

    A)  8 yr                             

    B)  10 yr

    C)  12 yr                           

    D)  14 yr

    Correct Answer: B

    Solution :

    Let the principal be Rs. x Amount \[=Rs.\,3x\] \[\therefore \]      Interest \[=Rs.\,2x\] Time \[=20\,yr\] \[\therefore \]      \[I=\frac{PRT}{100}\,\,\,\Rightarrow \,\,2x=\frac{x\times R\times 20}{100}\] \[\Rightarrow \]   \[R=10\] In second case,             \[I=Rs.\,x\]             \[P=Rs.\,x\]             \[R=10\]             \[T=?\] \[\therefore \]      \[I=\frac{PRT}{100}\] \[\Rightarrow \]   \[x=\frac{x\times 10\times T}{100}\] \[\therefore \]      \[T=10\,yr\]


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