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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
The dependency ratio is a measure showing the number of dependents, aged zero to 14 and over the age of 65, to the total population, aged 15 to 64. It is also referred to as the "total dependency ratio."
So the percentage of those not working is \(\cfrac{17}{25} \times 100% = 68%\)