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Sandeep • 6.47K Points
Tutor III Math 

Q. The population of village is 1,00,000. The rate of increase is 10% per annum. Find the population at the start of the third year?

  • (A) 1,33,100
  • (B) 1,21,000
  • (C) 1,18,800
  • (D) 1,20,000
Correct Answer - Option(B)
Explanation by: Sandeep 
100000 == 10%↑(1st year) ==> 110000 == 10%↑(2nd year) ==> 121000
Population at starting of 3rd year = 121000

[By using net percentage change method, we have saved our self from cumber some formulas on population which is based on compound interest].

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