New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If the population of a city increases by 20% every year

    and is expected to be 43,200 after 2 years, then what is its 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
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let, the present population be ‘x’.

    ATQ,

    Future population after 2 years = 1.20 × 1.20 × x = 43200

    Or, x = 43200 × (1/1.20) × (1/1.20)

    So, x = 30,000

    Therefore, present population = x = 30,000

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