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If a region has an annual growth rate of 2 percent, which approximate rule can be used to estimate doubling time?

Answer and explanation

Correct answer: Divide 70 by the growth rate

The Rule of 70 is a quick way to estimate how many years a population takes to double when its annual growth rate is fairly stable. The approximate formula is doubling time \(=70\div\) annual growth rate in percent. It is an estimate, not an exact prediction.

With a growth rate of 2 percent, the calculation is \(70\div2=35\) years. Thus option A is correct. The rule does not require multiplying the rate by 70, subtracting it from population, or adding birth and death rates. Its usefulness depends on treating the rate as approximately constant during the period considered.

Related tags

Rule Of 70Doubling TimePopulation Growth RateDemography FormulaPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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