Table 212 For the Output Levels in Table 21

Multiple Choice

Table 21.2 $\begin{array}{|l|r|r|r|r|}\hline \text { Output (units per day) } & 0 & 10 & 20 & 30 \\\hline \text { Total cost (dollars per day) } & \$ 40 & \$ 54 & \$ 62 & \$ 80\\\hline\end{array}$

For the output levels in Table 21.2,the minimum of the average variable cost curve occurs at a production rate of

A) Zero units per day.
B) 10 units per day.
C) 20 units per day.
D) 30 units per day.