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If a country's population grows by 20 percent each decade, why will more people be added in the second decade than in the first?

Answer and explanation

Correct answer: The second decade's growth applies to a larger population base

A percentage growth rate is applied to the population existing at the beginning of each period. After the first decade, the population is larger than it was initially. Therefore, the same 20 percent rate in the second decade is calculated on a larger base, producing a larger numerical addition even though the rate itself has not changed.

For example, if the initial population is 100, the first decade adds 20 and leaves 120. The second decade adds 20 percent of 120, which is 24. Thus 24 people are added in the second decade compared with 20 in the first. This is why option A is correct. The rate does not automatically rise; the base population rises.

Related tags

Compound GrowthPopulation BaseAbsolute IncreaseConstant Percentage GrowthPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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