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According to the Rule of 70, if a country's growth rate rises from 1 percent to 2 percent, what happens to the approximate doubling time?

Answer and explanation

Correct answer: It falls from about 70 to 35 years

The Rule of 70 gives an approximate doubling time by dividing 70 by the annual growth rate expressed as a percentage. It assumes that the growth rate remains constant throughout the period. A higher growth rate therefore means fewer years are needed for the population to double.

At 1 percent, doubling time is \(70\div1=70\) years. At 2 percent, it is \(70\div2=35\) years. Consequently, the estimated time falls from about 70 to 35 years, making option C correct. The rule is an approximation, but the comparison clearly shows that doubling the rate roughly halves the doubling time.

Related tags

Doubling TimeRule Of 70Growth Rate ComparisonPopulation DynamicsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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