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If a country's population is 50 million and it grows by 10 percent each year for two consecutive years, what will the population be after two years?

Answer and explanation

Correct answer: 60.5 million

A repeated annual percentage increase is applied to the new population each year, so it is compound growth rather than simple addition. After one year, multiply by \(1.10\). After two years, multiply by \(1.10\) again. This method ensures that the second increase is calculated on the already increased population.

Starting with 50 million, after one year the population is \(50\times1.10=55\) million. After the second year it is \(55\times1.10=60.5\) million, or 6.05 crore. Equivalently, \(50\times1.10^2=60.5\) million. Therefore, option B is correct. Simply adding 20 percent to the original gives 60 million and ignores compounding.

Related tags

Compound Population GrowthTwo Year GrowthPercentage IncreasePopulation CalculationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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