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A country's population grows from 100 million to 110 million and then to 121 million over an equal second interval. What can be said about the growth rates in the two intervals?

Answer and explanation

Correct answer: The first rate is 10 percent and the second is also 10 percent

Growth rate is calculated relative to the population at the beginning of each interval. During the first interval, the population rises from 100 million to 110 million, an increase of 10 million. Relative to 100 million, this is 10 percent. During the second interval, the increase is 11 million, but the starting population is now 110 million.

The second rate is \(11\div110\times100=10\) percent. Thus both equal intervals have the same percentage growth rate of 10 percent, even though the absolute increases differ: 10 million first and 11 million second. Option A is correct. Calling the second rate 11 percent incorrectly uses the original base of 100 million.

Related tags

Constant Growth RateCompound GrowthAbsolute IncreasePopulation PercentagePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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