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SSC Sample Paper SSC CGL - Sample Paper-11

  • question_answer
    A sum of money doubles itself at compound interest in 15 yr. In how many years it will become eight times?

    A) 30                                

    B) 45      

    C) 50                                

    D) 60

    Correct Answer: B

    Solution :

    \[2P=P{{\left\{ 1+\frac{r}{100} \right\}}^{1.5}}\] \[\therefore \]      \[{{\left\{ 1+\frac{r}{100} \right\}}^{1.5}}=2\]             \[{{2}^{3}}=8\,\text{times}\] \[\therefore \]      Required time \[=15\times 3\]                                   \[=45\,yr\]


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