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Two countries have growth rates of 1 percent and 2 percent respectively. If other conditions are similar, which will have the shorter doubling time?

Answer and explanation

Correct answer: The country growing at 2 percent

Doubling time is the time required for a population to become twice its present size. When other conditions are similar, a higher growth rate reaches doubling sooner. The relationship is inverse: as the annual growth rate increases, the number of years needed for doubling decreases.

The Rule of 70 gives an approximate doubling time by dividing 70 by the percentage growth rate. At 1 percent, the time is about \(70\div1=70\) years. At 2 percent, it is about \(70\div2=35\) years. Thus, the country growing at 2 percent doubles sooner. Option D is correct. The starting population does not change this comparison when the rates are compared under similar conditions.

Related tags

Growth RateDoubling TimePopulation ComparisonRule Of 70Population GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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