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      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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