Reference: 09-13
Brown Company Makes Four Products in a Single

Reference: 09-13
Brown Company makes four products in a single facility. These products have the following unit product costs: $\begin{array}{|l|c|c|c|c|}\hline&\text { Product }\\\hline &A&B&C&D\\\hline \text { Direct materials } & \$ 15.60 & \$ 19.50 & \$ 12.50 & \$ 15.20 \\\hline \text { Direct labour } & 17.60 & 21.00 & 15.40 & 9.40 \\\hline \begin{array}{l}\text { Variable manufacturing } \\\text { overhead }\end{array} & 4.40 & 5.60 & 8.10 & 5.10 \\\hline \begin{array}{l}\text { Fixed manufacturing } \\\text { overhead }\end{array} & 27.50 & 14.40 & 14.50 & 16.50 \\\hline \text { Unit product cost } & \underline{\underline{\$ 65.10}} & \$ 60.50 & \$ 50.50 & \$ 46.20 \\\hline\end{array}$
$\text { Additional data concerning these products are listed below. }$
$\begin{array}{|l|l|l|l|l|}\hline&\text { Product }\\\hline &A&B&C&D\\\hline \text { Grinding minutes per unit } & 2.00 & 1.10 & 0.70 & 0.30 \\\hline \text { Selling price per unit } & \$ 78.70 & \$ 71.10 & \$ 67.90 & \$ 62.60 \\\hline \begin{array}{l}\text { Variable selling cost per } \\\text { unit }\end{array} & \$ 2.60 & \$ 3.10 & \$ 2.80 & \$ 3.50 \\\hline \text { Monthly demand in units } & 3,000 & 2,000 & 2,000 & 4,000 \\\hline\end{array}$ The grinding machines are potentially the constraint in the production facility. A total of 10,500 minutes are available per month on these machines. Direct labour is a variable cost in this company.
-Up to how much should the company be willing to pay for one additional hour of grinding machine time if the company has made the best use of the existing grinding machine capacity

A) $0.00.
B) $21.90.
C) $10.60.
D) $19.25.