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Why is the old population taken as the base in a population-growth calculation?

Answer and explanation

Correct answer: Because change is measured in comparison with that initial number

The direct answer is A: change is measured in comparison with the initial population. Population growth may be expressed as an absolute increase or as a percentage. For percentage growth, the usual idea is: percentage growth = (new population − old population) ÷ old population × 100. The old population is the starting point, so it provides the reference for judging how large the increase is. For example, an increase of 10,000 people means something different in a population of 20,000 than in a population of 1,000,000. Option A is correct because the base makes the comparison meaningful. Option B is false: new population figures are not automatically wrong. Option C is false because population and area are different measurements. Option D is false because a percentage comparison requires a base. Memory cue: growth compares the change with where the population started; therefore, keep the old population in the denominator.

Related tags

Population GrowthBase PopulationPercentage CalculationPopulationGeographyClass 9 Mcq

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