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

  • question_answer
    The compound interest on Rs. 5600 for \[1\frac{1}{2}\] years at 10% per annum, compounded annually, is

    A)  Rs. 882.70          

    B)  Rs. 873.50

    C)  Rs. 868                  

    D)         Rs. 840

    Correct Answer: C

    Solution :

     Amount            \[=Rs.\left[ 5600\times \left( 1+\frac{10}{100} \right)\times \left( 1+\frac{\frac{1}{2}\times 10}{100} \right) \right]\] \[=Rs.\left( 5600\times \frac{11}{10}\times \frac{21}{20} \right)=Rs.6468\] \[\therefore \] C.I. \[=-Rs.(6468-5600)=Rs.868\]


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