Exhibit 7-9 Cost Schedule for Firm X -As Shown in Exhibit 7-9, the Marginal Cost of Producing

Exhibit 7-9 Cost schedule for firm X $$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Output } \\\text { Quantity }\end{array} & \begin{array} { c } \text { Total Fixed } \\\text { Cost }\end{array} & \begin{array} { c } \text { Total Variable } \\\text { Cost }\end{array} \\\hline 0 & \$ 100 & \$ 0 \\1 & 100 & 50 \\2 & 100 & 84 \\3 & 100 & 108 \\4 & 100 & 127 \\5 & 100 & 150 \\\hline\end{array}$$
-As shown in Exhibit 7-9, the marginal cost of producing the third unit is:

A) $50.
B) $16.
C) $24.
D) $23.