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A country's population rises from 2.5 million to 2.75 million. What is the percentage increase?

Answer and explanation

Correct answer: 10 percent

Percentage increase compares the amount added with the original amount, not with the final amount. First subtract the initial population from the final population to find the absolute increase. Then divide that increase by the initial population and multiply by 100. Keeping the same units throughout avoids confusion between millions and individual people.

The increase is \(2.75-2.5=0.25\) million, or 250,000 people. The percentage increase is \((0.25/2.5)\times100=10\) percent. Equivalently, \(250000\div2500000\times100=10\) percent. Therefore, option C is correct. Using the final population as the denominator would calculate a different measure.

Related tags

Population PercentageGrowth CalculationBase PopulationDemographyPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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