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

  • question_answer
    If an amount Rs. 8000 becomes to Rs. 9200 in 3 years at simple interest. If the rate of interest is increased by 3%, it would amount to?

    A)  Rs. 9920           

    B)         Rs. 10560

    C)  Rs. 11120        

    D)         Rs. 11820

    Correct Answer: A

    Solution :

      Principal \[=Rs.\text{ }8000,\] S.I. \[=Rs.\text{ }1200,\] Time = 3 years \[\therefore \]   Rate \[=\left( \frac{100\times 1200}{8000\times 3} \right)%=5%\] New rate \[=8%,\]Principal \[=Rs.\text{ }8000,\] Time = 3 years. \[S.I.=Rs.\,\left( \frac{8000\times 8\times 3}{100} \right)=Rs.1920\] \[\therefore \]New amount \[=Rs.\,(8000+1920)=Rs.9920\]


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