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Railways R.R.C. (Chennai) Solved Paper Held on 2nd Shift 9-11-2014

  • question_answer
    The simple interest on a sum at 5% per year for 3 years and 4 years differ by \[90{}^\circ \]Rs. 42. What is the sum?

    A) Rs. 600             

    B) Rs. 720

    C) Rs. 780             

    D) Rs. 840

    Correct Answer: D

    Solution :

    Suppose sum =Rs. P Then     \[\frac{P\times 5\times 4}{100}-\frac{P\times 5\times 3}{100}=42\] \[\frac{P\times 5}{100}=42\] \[P=\frac{42\times 100}{5}\] \[P=Rs.\,\,840\]


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