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SSC Sample Paper SSC CGL - Sample Paper-1

  • question_answer
    A sum of money placed at compound interest triples itself in 5 yr. In how many years will it amount to nine times itself?

    A)  12 yr               

    B)  10 yr    

    C)  15 yr                           

    D)  18 yr

    Correct Answer: B

    Solution :

    Let Rs. P be the principal. \[\therefore \]      \[3P=P{{\left( 1+\frac{r}{100} \right)}^{5}}\]             \[3={{\left( 1+\frac{r}{100} \right)}^{5}}\]                                ? (i) Let the sum will be nine times in n yr. \[\therefore \]      \[9P=P{{\left( 1+\frac{r}{100} \right)}^{n}}\]             \[{{(3)}^{2}}={{\left( 1+\frac{r}{100} \right)}^{n}}\]              ? (ii)    \[n=10\,yr\]


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