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

  • question_answer
    Mr. Mittal finds that an increase in the rate of interest from \[4\frac{7}{8}\]% to \[5\frac{1}{8}\]% per annum increases his yearly income by Rs. 250. His investment is

    A)  Rs. 1,00,000        

    B)  Rs. 1,20,000

    C)  Rs. 1,50,000     

    D)         Rs. 2,00,000

    Correct Answer: A

    Solution :

     Let the investment be Rs. x. Then \[x\times \frac{41}{8}\times \frac{1}{100}-x\frac{39}{8}\times \frac{1}{100}=250\]                 or            \[2x=200000\]                 or            \[x=100000\]


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