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If the population increases from 4,000 to 4,800, what is the percentage growth?

Answer and explanation

Correct answer: 20%

The direct answer is B: 20%. First find the absolute increase: 4,800 − 4,000 = 800. Percentage growth uses the initial population as the base, so calculate (increase ÷ initial population) × 100. Thus, (800 ÷ 4,000) × 100 = 0.2 × 100 = 20%. A would represent an increase of only 400 people from the base of 4,000. C would require an increase of 1,000, and D would require an increase of 1,600. The common mistake is dividing by the new population; percentage growth normally uses the starting population. Memory cue: find the change, divide by the beginning, then multiply by 100.

Related tags

Percentage GrowthPopulation CalculationInitial PopulationPopulation GrowthPopulationGeographyClass 9 Mcq

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