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

    Question

    The population of a village increase at the rate of 10%

    during the first year and decreases at the rate of 20% during the second year. If it has 20240 inhabitants at present then find the number of inhabitants two years before
    A 25000 Correct Answer Incorrect Answer
    B 22500 Correct Answer Incorrect Answer
    C 23000 Correct Answer Incorrect Answer
    D 20000 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    Let the number of inhabitants two years ago = x = x*110/100*80/100 = 20240 =20240*110/100*80/100= 23,000

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