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Difficulty: MediumPopulation Concepts and Growth Dynamics

A demographic survey carried out in an agricultural district in Nigeria recorded the following age structure: 24,30024,300 children under 15 years of age, 45,00045,000 adults in the economically active age range of 15–64 years, and 6,3006,300 elderly residents aged 65 years and above. What is the dependency ratio of this district, expressed as a percentage?

Answer: 68 %

Answer

68%
The dependency ratio expresses the relationship between the dependent segment of the population (those under 15 and those 65 and above) and the productive segment (ages 15–64). Summing the dependents (24,300+6,30024,300 + 6,300) gives 30,60030,600. Dividing 30,60030,600 by the working-age population of 45,00045,000 and multiplying by 100100 yields 68%68\%.

Step-by-Step Solution

1
Determine the size of the dependent population.
Total dependents = 24,300+6,300=30,60024,300 + 6,300 = 30,600.
Demographic dependency includes individuals under 15 years and those aged 65 years and older.
2
Calculate the dependency ratio.
Dependency Ratio=(30,60045,000)×100=68%\text{Dependency Ratio} = \left(\frac{30,600}{45,000}\right) \times 100 = 68\%.
The dependency ratio measures the number of economic dependents supported by every 100 working-age individuals.

Key Concept

Dependency Ratio Calculation
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Topics

Population Concepts and Growth Dynamics

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