JAMB - Economics (2003 - No. 8)

\(\begin{array}{c|c} \text{Out put produced per day (Units)} & \text{Fixed cost per day (N)} & \text{Total cost per day (N)} \\ \hline 20 & 60 & 100 \\ \hline 30 & 60 & 120 \\ \hline 40 & 60 & 130 \\ \hline 50 & 60 & 135 \\ \hline 60 & 60 & 150 \\ \hline 70 & 60 & 170 \\ \hline 80 & 60 & 190\end{array}\)

Using the table above. The ATC at 30 units of output is