Table 8-A -Refer to Table 8-A

Table 8-A
$$\begin{array} { c c c } \text { Quantity } & \text { Total Revenue } & \text { Total Cost } \\8 & 95 & 90 \\9 & 105 & 93 \\10 & 114 & 98 \\11 & 122 & 105 \\12 & 129 & 114\end{array}$$
-Refer to Table 8-A.The marginal cost of the last unit produced at the profit-maximizing level of output is equal to:

A) $5.
B) $7.
C) $8.
D) $10.
E) none of the above.

Correct Answer:

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