This Phone Center Uses Only Equipment and Workers to Provide

This phone center uses only equipment and workers to provide service. $$\begin{array} { | c | c | c | c | c | c | } \hline \begin{array} { c } \text { Output } \\\text { (units) }\end{array} & \text { Equipment } & \text { Workers } & \text { Total Cost } & \begin{array} { c } \text { Marginal } \\\text { Cost }\end{array} & \begin{array} { c } \text { Average } \\\text { Variable Cost }\end{array} \\\hline 0.5 & 1 & 2 & & & \\\hline 1 & 1 & 4 & & & \\\hline 3 & 1 & 6 & & & \\\hline 8 & 1 & 8 & & & \\\hline 11 & 1 & 10 & & & \\\hline 12 & 1 & 12 & & & \\\hline\end{array}$$
Relative to costs when equipment cost $10,if the price of equipment increased to $20 and nothing else changed,

A) Total Cost would increase by $10 per unit of output.
B) Marginal Cost would increase by $20 divided by units of output.
C) Marginal Cost would not change.
D) Average Total cost would increase by $10 at each level of output.