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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 ‘x’.

      ATQ,

      Population after 2 years = 1.12 × 1.12 × x = 31360

      Or, x = 31360 × (1/1.12) × (1/1.12)

      So, x = 25,000

      Therefore, present population = x = 25,000

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