Assume Manfred's Shoe Shine Parlor Hires Labor, Its Only Variable

Multiple Choice

Assume Manfred's Shoe Shine Parlor hires labor, its only variable input, under purely competitive conditions. Shoe shines are also sold competitively. $\begin{array} {| c | c | c | c|} \text { Units of Labor } & \text { Total Product } & \begin{array} { c } \text { Marginal } \\\text { Product }\end{array} & \begin{array} { c } \text { Total } \\\text { Revenue }\end{array} \\\hline 0 & 0 & & \\\hline 1 & 14 & 14 & \$ 42 \\\hline 2 & & 10 & \\\hline 3 & 30 & & 90 \\\hline 4 & 35 & & \\\hline 5 & 39 & & 117 \\\hline 6 & & & 126 \\\hline 7 & 44 & 2 & 132 \\\hline\end{array}$ If the wage rate is $11 and Manfred's only fixed input is capital, the total cost of which is $30, then what will be his economic profit?

A) $62
B) $42
C) $28
D) $32