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In a population, 45 percent are dependents and 55 percent are of working age. Approximately how many dependents are there per 100 working-age people?

Answer and explanation

Correct answer: About 82

The governing concept is the dependency ratio, which compares the dependent population with the working-age population rather than with the entire population. The formula is: dependency ratio = (dependents ÷ working-age population) × 100. Substituting the given shares gives (45 ÷ 55) × 100 = 81.818..., which rounds to approximately 82 dependents per 100 working-age persons. Thus, option A is correct. Option B incorrectly uses the dependent percentage in the total population as though it were the ratio per 100 workers. Option C is the working-age share, not the calculated ratio, and option D results from using the wrong relationship or denominator. Identifying the base population before calculation prevents this common error.

Related tags

Dependency RatioPopulation CalculationDependentsWorking Age GroupAge StructurePopulation CompositionGeographyClass 12 Mcq

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