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
    The population of a village increases @ 5% p.a. If present population is 8000, after how many years the population will be 9261?

    A)  2 Years

    B)         3 Years

    C)  \[3\frac{1}{2}\] Years   

    D)  4 Years

    Correct Answer: B

    Solution :

    [b] Let population become 9261 in ?x? years. \[\frac{Amount}{\text{Principal}}={{\left( 1+\frac{Rate}{100} \right)}^{Time}}\] \[\therefore \] \[\frac{9261}{8000}={{\left( \frac{21}{20} \right)}^{x}}\] \[\therefore \] \[{{\left( \frac{21}{20} \right)}^{3}}={{\left( \frac{21}{20} \right)}^{x}}\] \[\therefore \] Time = 3 years


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