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8th Class Mathematics Comparing Quantities Question Bank Comparing Quantities

  • question_answer
    In what time will Rs.1000 amount to Rs.1331 at 10% p.a. compounded annually?

    A)  4 years                                

    B)                         3 years                

    C)                         2 years                                

    D)                         1 year                  

    Correct Answer: B

    Solution :

    \[Rs.\,\,1331=Rs.\,\,1000\,{{\left( 1+\frac{10}{100} \right)}^{n}}\] \[\Rightarrow \]               \[\frac{1331}{1000}={{\left( \frac{11}{10} \right)}^{n}}\] \[\Rightarrow \]               \[{{\left( \frac{11}{10} \right)}^{3}}={{\left( \frac{11}{10} \right)}^{n}}\] \[\Rightarrow \] \[n=3\] years


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