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

  • question_answer
    The simple interest on a sum of money will be Rs. 6000 after 10 years. If the principal is triple after 5 years, what will be the total interest at the end of the tenth year?

    A)  Rs. 6000         

    B)         Rs. 9000

    C)  Rs. 12000         

    D)         Rs. 15000

    Correct Answer: C

    Solution :

      Let sum =x, \[S.I.=Rs.\text{ }6000,\]Time = 10 years. Rate \[=\left( \frac{100\times 6000}{x\times 10} \right)=\left( \frac{60000}{x} \right)%\] S.I. for last 5 years                 \[=Rs.\left( \frac{x\times 5\times 60000}{x\times 100} \right)=Rs.3000\] S.I. for last 5 years \[=Rs.\left( 3x\times 5\times \frac{60000}{x\times 100} \right)\]                 \[=Rs.9000\] \[\therefore \] Total interest \[=\text{ }Rs.12000.\]


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