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    Question

    The population of a city grows by 12% annually. If the

    population after 2 years will be 31,360, what is the present population?
    A 20,000 Correct Answer Incorrect Answer
    B 60,000 Correct Answer Incorrect Answer
    C 30,000 Correct Answer Incorrect Answer
    D 25,000 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let, the present population be тАШxтАЩ.

    ATQ,

    Population after 2 years = 1.12 ├Ч 1.12 ├Ч x = 31360

    Or, x = 31360 ├Ч (1/1.12) ├Ч (1/1.12)

    So, x = 25,000

    Therefore, present population = x = 25,000

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