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If population grows by 14 percent in the first year and 6 percent in the second, what is the approximate total two-year growth?

Answer and explanation

Correct answer: 20.84 percent

Growth in two successive years is compounded because the second percentage applies to the population after the first year’s increase. If the initial population is represented by 100, after a 14 percent rise it becomes 114. A further 6 percent rise is calculated on 114, not on the original 100.

The combined multiplier is \(1.14\times1.06=1.2084\). Thus the final population is 120.84 percent of the starting population, giving a total increase of 20.84 percent. Option B is therefore correct. Adding 14 percent and 6 percent gives only 20 percent and misses the additional 0.84 percent produced when the second increase acts on the first year’s increase.

Related tags

Compound GrowthSuccessive Annual RatesPopulation PercentageDemography MathsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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