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If the elderly share rises from 10 percent to 15 percent while total population increases by 20 percent, what happens to the absolute number of elderly people?

Answer and explanation

Correct answer: It will increase by about 80 percent

To find the change in the absolute number of elderly people, both the elderly share and the total population must be considered. A rise in the share from 10% to 15% is a relative change in composition, while a 20% rise in total population changes the number to which the share is applied.

Take the initial population as 100. Initially, elderly people number 10. After a 20% increase, the total population is 120. The new elderly number is \(15/100\times120=18\). The increase is from 10 to 18, or \(8/10\times100=80\%\). Therefore, option C is correct. The answer is not 50%, because that compares the shares alone and ignores total population growth.

Related tags

Elderly PopulationPercentage ChangeAbsolute ChangeAge Structure CalculationAge StructurePopulation CompositionGeographyClass 12 Mcq

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