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A country's population rises from 50 million to 60.5 million. What is the percentage population growth during this period?

Answer and explanation

Correct answer: 21 percent

Percentage population growth is measured against the initial population, not the final population. The population increases from 50 million to 60.5 million, so the absolute increase is 10.5 million. Using the percentage-growth formula, \(\frac{\text{increase}}{\text{initial population}}\times100\), we get \(\frac{10.5}{50}\times100=21\) percent.

The same result can be seen by noting that 60.5 million is 1.21 times 50 million, which means the increase is 0.21 of the original amount. Therefore the correct choice is option C, 21 percent. Dividing by the final population would answer a different question and would incorrectly produce a smaller percentage, so the initial population must be used as the base.

Related tags

Percentage Population GrowthAbsolute GrowthPopulation CalculationDemography MathsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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