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If population first grows by 35 percent and then declines by 25 percent, what is the final change relative to the initial population?

Answer and explanation

Correct answer: 1.25 percent increase

Successive percentage changes must be applied one after another to the changed amount. They cannot be combined by simply subtracting 25 from 35, because the second percentage is calculated from the population after the first change. A convenient starting value is 100, which represents 100 percent of the original population.

After a 35 percent increase, 100 becomes 135. A 25 percent decrease removes \(25\%\) of 135, which is \(135\times0.25=33.75\). The final value is \(135-33.75=101.25\). Compared with the original 100, this is a 1.25 percent increase. Thus, option A is correct.

Related tags

Successive Percentage ChangePopulation Growth DeclineCompound EffectPopulation CalculationPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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