(Table) Based on the Table, What Is the Value of A

Multiple Choice

(Table) Based on the table, what is the value of A?
$\begin{array}{|c|c|c|c|}\hline \text { Units of Labor } & \begin{array}{c}\text { Quantity of } \\\text { Output }\end{array} & \text { Product Price } & \begin{array}{c}\text { Marginal } \\\text { Revenue Product }\end{array} \\\hline 1 & 20 & \$ 10 & \\\hline 2 & 28 & 10 & \text { A } \\\hline 3 & 35 & 10 & \text { B } \\\hline 4 & 41 & 10 & \text { C } \\\hline 5 & \text { D } & 10 & \$ 30 \\\hline 6 & 35 & 10 & \\\hline\end{array}$

A) $280
B) $28
C) $80
D) $8