2. Sample Papers
  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
    Population of a town increases at a certain rate per cent per annum. Present population of the town is 3600 and in 5 years it becomes 4800. How much will it be in 10 years?

    A)  5000   

    B)  6000

    C)  6400               

    D)  7000

    Correct Answer: C

    Solution :

    [c] Let rate of increase in population = r% p.a. Then \[4800=3600{{\left( 1+\frac{r}{100} \right)}^{5}}\] \[\therefore \] \[{{\left( 1+\frac{r}{100} \right)}^{5}}=\frac{4800}{3600}=\frac{4}{3}\] Population in the next 5 years will become \[4800\times \frac{4}{3}=6400.\]


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