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If a country's growth rate is 0.625 percent, what is the approximate doubling time according to the Rule of 70?

Answer and explanation

Correct answer: 112 years

The Rule of 70 gives a quick estimate of the time needed for a population to double when its annual growth rate remains roughly constant. It uses the number 70 because dividing 70 by the percentage growth rate gives an approximate doubling period in years. A smaller growth rate means that doubling takes longer, while a larger rate means a shorter period.

Here the growth rate is 0.625 percent. Apply the rule: \(70 \div 0.625 = 112\) years. Thus, the estimated doubling time is 112 years, so option C follows. The result is an approximation, not an exact prediction, because real population growth may change due to births, deaths, migration, and changing social conditions.

Related tags

Doubling Time0.625 Percent GrowthRule Of 70Population GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And GrowthGeography

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