The population of a town increased by 10% in the first year and decreased by 10% in the second year. If the population at the end of the second year is 990000, then find the population at the beginning of the first year.

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SSC GD Constable (2022) Official Paper (Held On : 07 Feb 2023 Shift 3)
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  1. 12,00,000
  2. 10,00,000
  3. 13,00,000
  4. 15,00,000

Answer (Detailed Solution Below)

Option 2 : 10,00,000
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Let's denote the initial population by P.

After two years, the population = P * (1 + 10/100) * (1 - 10/100)

Therefore, P = 990000 / ((1 + 10/100) * (1 - 10/100)) = 1,000,000.

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