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?

Answer: Option B

100000 == 10%↑(1^st year) ==> 110000 == 10%↑(2^nd year) ==> 121000
Population at starting of 3^rd 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].