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10th Class Mathematics Related to Competitive Exam Question Bank Commercial Mathematics

  • question_answer
    For how many years should Rs. 1200 be invested at 10% p.a. in order to earn the same simple interest as is earned by investing Rs. 1800 at 12% p.a. for 5 years?

    A)  9                              

    B)         10

    C)  12                         

    D)         11

    Correct Answer: A

    Solution :

    S.I. required \[=Rs.\left( \frac{1800\times 12\times 5}{100} \right)=Rs.1080\] Time \[=\left( \frac{100\times 1080}{1200\times 10} \right)\] years = 9 years


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