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A country's population rises from 55 million to 64.9 million. What is the percentage population growth over the period?

Answer and explanation

Correct answer: 18 percent

The correct answer is B: 18 percent. Percentage population growth is found by comparing the increase with the initial population. First calculate the increase: 64.9 million − 55 million = 9.9 million. Then apply the formula: percentage growth = (increase ÷ initial population) × 100 = (9.9 ÷ 55) × 100 = 18 percent. Option B is therefore correct. Option A would give an increase of only 8.8 million when applied to 55 million, so it is too low. Option C would imply an increase of 11 million, which is greater than the actual 9.9 million. Option D would imply an even larger increase of 12.1 million. Do not use the final population, 64.9 million, as the denominator; the standard percentage change is measured from the starting value. Also distinguish absolute growth, which is 9.9 million, from relative growth, which is 18 percent. Memory cue: subtract first, then divide by the original, then multiply by 100.

Related tags

Percentage Population GrowthAbsolute GrowthRelative GrowthDemography CalculationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And GrowthGeography

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