Exhibit 7-10 Short-Run Cost Schedule for Book Publisher's Hourly Production

Exhibit 7-10 Short-run cost schedule for book publisher's hourly production $$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Total } \\\text { Output }\end{array} & \begin{array} { c } \text { Total } \\\text { Variable Cost }\end{array} & \begin{array} { c } \text { Total } \\\text { Cost }\end{array} \\\hline 0 \text { cases of books } & \$ 0 & \$ 200 \\1 & 100 & 300 \\2 & 150 & 350 \\3 & 250 & 450 \\4 & 450 & 650 \\\hline\end{array}$$
-In Exhibit 7-10, the publisher's fixed cost is equal to:

A) $50.
B) $100.
C) $200.
D) $300.