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If population rises from 400000 to 420000, what is the percentage growth?

Answer and explanation

Correct answer: 5 percent

Percentage growth compares the increase with the starting population, not with the final population. First find the absolute increase by subtracting the initial value from the final value. Then divide that increase by the initial value and multiply by 100. This method works for population, money, production, or any other quantity.

The increase is \(420000-400000=20000\). Hence percentage growth is \(\frac{20000}{400000}\times100=5\) percent. Therefore, option C is correct. Using 420000 as the denominator would calculate a different proportion and would not represent the standard growth relative to the original population.

Related tags

Percentage Population GrowthGrowth CalculationDemography MathsPopulation IncreasePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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