\(\begin{array}{c|c}
\text{Age group(years)} & \text{Distribution(%)} \\ \hline
\text{Above 60} & 30 \\
\hline
15 - 60 & 45 \\
\hline
0 - 14 & 25 \\
\end{array}\)

The estimated dependency ratio of the population distribution shown here is

\(\begin{array}{c|c}
\text{Population(Million)} & \text{Food Production(Milion tonnes)} \\
50 & 220 \\
70 & 210 \\
90 & 225 \\
100 & 275 \\
\end{array}\)

In the data above, what is the optimum population in million?

\(\begin{array}{c|c}
\text{Quantity of singlets} & \text{Short run total costs(N)} \\
0 & 1,000 \\
10 & 1,200 \\
20 & 1,400 \\
30 & 1,600 \\
40 & 1,800 \\
\end{array}\)

The short run total costs for different levels of output for a firm producing singlets are shown above. Calculate the variable cost per unit at an output of 20.

The type of business organizations mostly used for producing public goods in Nigeria is