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If 64 percent of a country's population is of working age and the old-age dependency ratio is 25, what percentage of the total population is elderly?

Answer and explanation

Correct answer: 16 percent

The old-age dependency ratio compares the elderly population with the working-age population, not directly with the total population. If the working-age share is 64 percent and the ratio is 25, then elderly people equal 25 percent of the working-age share. Let E represent the elderly percentage of the total population. The relationship is \(E/64\times100=25\), so \(E=64\times25/100=16\) percent.

Therefore option B is correct. A value of 25 percent would be the dependency ratio itself, not the elderly share of the whole population. The calculation assumes that the stated ratio uses the usual definition of elderly population divided by working-age population, multiplied by 100. Under that standard definition, the answer is 16 percent.

Related tags

Old-Age DependencyElderly ShareReverse CalculationAge StructurePopulation CompositionGeographyClass 12 Mcq

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