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

  • question_answer
    What annual payment will discharge a debt of Rs. 1740 due in 5 years, the rate being 8% per annum?

    A)  Rs. 360           

    B)         Rs. 300  

    C)  Rs. 320          

    D)         Rs. 340

    Correct Answer: B

    Solution :

     Let the annual instalment be Rs. x. Then, \[\left[ x+\left( \frac{x\times 4\times 8}{100} \right) \right]+\left[ x+\left( \frac{x\times 3\times 8}{100} \right) \right]\] \[+\left[ x+\left( \frac{x\times 2\times 8}{100} \right) \right]+\left[ x+\left( \frac{x\times 1\times 8}{100} \right) \right]+x=1740\]or \[\frac{33x}{25}+\frac{31x}{25}+\frac{29x}{25}+\frac{27x}{25}+x=1740\] or            \[x=300\]


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