Given the Following Data,calculate Product Cost Per Unit Under Variable

Given the following data,calculate product cost per unit under variable costing.
$\begin{array}{|l|c|}\hline \text { Direct labor } & \$ 7 \text { per unit } \\\hline \text { Direct materials } & \$ 1 \text { per unit } \\\hline \text { Overhead } & \\\hline \text { Total variable overhead } & \$ 20,000 \\\hline \text { Total fixed overhead } & \$ 90,000 \\\hline & \\\hline \text { Expected units to be produced } & 40,000 \text { units } \\\hline\end{array}$

A) $8 per unit
B) $8.50 per unit
C) $10.25 per unit
D) $10.75 per unit
E) $12 per unit