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If a country's population rises from 20 million to 30 million over 25 years, what is the total percentage growth?

Answer and explanation

Correct answer: 50 percent

Total percentage growth compares the absolute increase with the initial population. The time period is useful for calculating an annual growth rate, but it is not needed when the question asks only for the total percentage increase over the whole period.

The absolute increase is \(30-20=10\) million. Divide this by the initial 20 million and multiply by 100: \((10\div20)\times100=50\%\). Therefore option C is correct. Dividing by 25 would answer a different question about an average annual measure, and using 30 million as the denominator would not give the standard percentage growth from the starting population.

Related tags

Long Term Population GrowthPercentage ChangeAbsolute GrowthPopulation CalculationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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