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

  • question_answer
    The strength of a Day Boarding School increases and decreases every alternate year. It starts with increase by 10% and thereafter the percentage of increase/decrease is the same. Which of the following is definitely true about the strength of the Day Boarding School in year 2001 as compared to that in year1997?

    A) Decrease approximately by 20%

    B)  Increase approximately by 2%

    C)  Increase approximately by 20%

    D)  Decrease approximately by 2%

    Correct Answer: D

    Solution :

    Suppose strength of school in 1997 =100 Strength in 1998 after 10% increase                                     \[=100\times \frac{100+10}{100}=110\] In 1999, 10% decrease \[=110\times \frac{100-10}{100}=99\] In 2000, 10% increases \[=99\times \frac{100+10}{100}=108.9\] In 2001, 10% decrease \[=108.9\times \frac{100-10}{100}=98.01\] Per cent decrease \[=100-98.01=\frac{1.99}{100}\times 100\] \[=1.99%=2%\]


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