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Difficulty: HardPopulation Concepts and Growth Dynamics

In a demographic survey of a municipality in Nigeria, the total population was recorded as 120000120{}000. The survey revealed that 42%42\% of the population is under 1515 years of age, and 6%6\% is aged 6565 years and above. Calculate the total dependency ratio of the municipality (expressed as a percentage rounded to one decimal place).

Answer: 92.3 %

Answer

The total dependency ratio of the municipality is 92.3%.
The total dependency ratio expresses the number of dependents (youth under 15 and elderly 65 and over) relative to the working-age population (15 to 64). Here, dependents constitute 48% (42% + 6%) of the population, leaving 52% (100% - 48%) in the working-age cohort. Dividing the dependents by the working age group gives (48 / 52) × 100 = 92.3%.

Step-by-Step Solution

1
Calculate the dependent population percentage and working-age population percentage.
Dependent population percentage = 42% + 6% = 48%; Working-age population percentage = 100% - 48% = 52%.
Demographic dependents consist of youth under 15 years and elderly aged 65 years and above, while the active labor force consists of age groups between 15 and 64 years.
2
Substitute the cohort percentages into the standard dependency ratio formula.
Dependency Ratio = (48 / 52) × 100
The dependency ratio measures the economic burden carried by the productive segment of the population per 100 working-age individuals.
3
Compute the numerical value and round to one decimal place.
92.3%
Dividing 48 by 52 yields approximately 0.92307, which converts to 92.3%.

Key Concept

Dependency Ratio Calculation
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Topics

Population Concepts and Growth Dynamics

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