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A country's population rises from 10 million to 12.1 million in five years. What is the total percentage growth?

Answer and explanation

Correct answer: 21 percent

Answer: D. Total percentage growth is calculated from the absolute increase divided by the initial population, multiplied by 100. The increase is 12.1 − 10 = 2.1 million. Therefore, percentage growth is 2.1 ÷ 10 × 100 = 21%. D is correct. A, B, and C are incorrect because none equals the calculated 21%. The five-year period tells us how long the increase took, but the question asks for total growth, not the average annual rate or annual compound rate. It would be a mistake to divide 21% by five without being asked for an average, or to calculate a compound annual rate. Memory cue: total percentage change = (final − initial) ÷ initial × 100; the initial value is always the denominator.

Related tags

Total Percentage GrowthPopulation IncreasePercentage CalculationPopulation ChangePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And GrowthGeography

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