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According to the Rule of 70, what is the approximate doubling time at an annual growth rate of 1 percent?

Answer and explanation

Correct answer: 70 years

The Rule of 70 is a quick method for estimating how long a quantity will take to double when it grows at a steady annual percentage rate. The estimated doubling time is calculated by dividing 70 by the annual growth rate expressed as a number, not as a decimal. It is an approximation, so the actual time may differ slightly under changing conditions.

For a growth rate of 1 percent per year, apply \(\text{doubling time}=70\div1=70\) years. Therefore option C is correct. A rate of 2 percent would give about 35 years, which explains why option A is not suitable here. The estimate assumes continued growth at approximately the same rate and does not account for sudden changes in fertility, mortality, or migration.

Related tags

Doubling TimeRule Of 70One Percent GrowthPopulation ProjectionPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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