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If population rises from 200000 to 220000, what is the percentage growth?

Answer and explanation

Correct answer: 10 percent

Percentage growth is calculated by dividing the increase by the initial population and multiplying by 100. The increase is \(220000-200000=20000\). Therefore, the percentage growth is \(20000\div200000\times100=10\) percent. The initial population must be used as the denominator, because percentage change measures the change relative to the starting value. Thus, option D is correct.

A useful check is that 10 percent of 200000 is 20000, exactly the number added. Using the final population as the denominator would answer a different question and give about 9.09 percent, which is not the standard growth percentage here. The values 5 percent and 8 percent are too small, while 9 percent results from an incorrect base. Hence, the correct answer is 10 percent.

Related tags

Percentage GrowthPopulation CalculationGrowth RateDemography MathsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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