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If a population grows by 12 percent in one year and 8 percent in the next, what is the approximate total growth?

Answer and explanation

Correct answer: 20.96 percent

When growth occurs in successive years, the second percentage is applied to the population after the first year's growth. Therefore, the two rates should be combined using growth multipliers, not simply added. A 12% increase gives a multiplier of 1.12, and an 8% increase in the next year gives a multiplier of 1.08.

The combined multiplier is \(1.12\times1.08=1.2096\). This means the final population is 120.96% of the original, so the total increase is 20.96%. Therefore option B is correct. Adding 12% and 8% gives only 20% and ignores the extra 8% applied to the population already enlarged during the first year.

Related tags

Compound GrowthSuccessive Annual RatesPopulation CalculationPercentage ChangePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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