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SSC Sample Paper Mock Test-17 SSC CGL Tear-II Paper-1

  • question_answer
    The population of a village has increased annually at the rate of 25%. If at the end of 3 yr it is 10000 the population in the beginning of the first year was

    A) 5120

    B)  5000

    C)  4900   

    D)  4500

    Correct Answer: A

    Solution :

    Population in the beginning of the year Population after 3 yr \[=\frac{\text{Population}\,\,\text{after}\,\,\text{3}\,\,\text{yr}}{{{\left( 1+\frac{R}{100} \right)}^{T}}}\]             \[=\frac{10000}{{{\left( 1+\frac{25}{100} \right)}^{3}}}=\frac{10000}{{{\left( \frac{5}{4} \right)}^{3}}}=\frac{10000\times 64}{125}=5120\]


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