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  3. Railways
  4. Quantitative Aptitude
  5. Compound Interest

Railways Quantitative Aptitude Compound Interest Sample Paper Simple Interest & Compund Interest Sample Test Paper-15

  • question_answer
    Of a certain sum, \[\frac{1}{3}\]rd. is invested at 3%, \[\frac{1}{6}\]th at 6% and the rest at 8%. If the SI for 2 years from all these investments amounts to Rs. 600, then the original sum was

    A)  Rs. 2000          

    B)  Rs. 3000

    C)  Rs. 4000          

    D)  Rs. 5000

    Correct Answer: D

    Solution :

    [d] Remaining part \[=1-\left( \frac{1}{3}+\frac{1}{6} \right)=\frac{1}{2}\] Average rate % per annum (R) \[=\left( \frac{1}{3}\times 3 \right)+\left( \frac{1}{6}\times 6 \right)+\left( \frac{1}{2}\times 8 \right)=6%\] SI = Rs. 600 T = 2 years, P =? \[I=\frac{PTR}{100}\] \[P=\frac{100\times I}{TR}\] \[=\frac{100\times 600}{2\times 6}\] = Rs. 5000.


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