Multiple Choice Questions on The population of a city is 5 million and it increases by 20 annually How many years would it take t........... for CDS Exam Preparation

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Multiple Choice Questions

The population of a city is 5 million and it increases by 20 annually How many years would it take t...........

Quantitative Aptitude (CDS) Percentage
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    The population of a city is 5 million and it increases by 20% annually. How many years would it take to double at its growth rate?

     

    3.8years
     

    Correct Answer

    3.3years
     

    Incorrect Answer

    4years
     

    Incorrect Answer

    5.6years


     

    Incorrect Answer
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    Explanation:

    2= (1+1/5)^n
    (6/5)^n = 2
    (1.2)^n = 2
    n log 1.2 = log2.
    = 0.3010/0.079
    = 3.8years

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