Table 14-3
the Table Represents a Demand Curve Faced by a Firm

Multiple Choice

Table 14-3
The table represents a demand curve faced by a firm in a competitive market.
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$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Quantity Demanded } \\\text { (Units) }\end{array} & \begin{array} { c } \text { Total Revenue } \\\text { (Dollars) }\end{array} \\\hline 13 & 91 \\\hline 15 & 105 \\\hline 17 & 119 \\\hline 19 & 133 \\\hline 21 & 147 \\\hline\end{array}$$
-Refer to Table 14-3. For this firm, the marginal revenue of the 15th unit is

A) $1.
B) $2.
C) $7.
D) The marginal revenue cannot be determined without knowing the total revenue when 15 units are sold.