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    Question

    The population of a town increases by 20% per annum. If

    the population after 2 years is 43,200, find its present population.
    A 25028 Correct Answer Incorrect Answer
    B 23320 Correct Answer Incorrect Answer
    C 12530 Correct Answer Incorrect Answer
    D 30000 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let, the present population be тАШxтАЩ.

    ATQ,

    So, the population after 2 years = 1.20 ├Ч 1.20 ├Ч x = 43200

    Or, x = 43200 ├Ч (1/1.20) ├Ч (1/1.20)

    So, x = 30,000

    Therefore, present population of the town = x = 30,000

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