A Company Has the Following Information for Its First Month

A company has the following information for its first month of operations: $\begin{array}{ll}\hline \text { Raw materials used } & \$ 25,000 \\\text { Sales (\$65 per unit) } & \$ 78,000 \\\text { Directlabor } & \$ 42,000\\\text { Variable factory overhead }&\$17,000\\\text { Fixed factory overhead unknown }\\\text { Variable sellingand administrative }&\$3,000\\\text { Fixed sellingand administrative }&\$5,000\\\text { Gross profit }&\$30,000\\\text { Contributionmargin }&\text { unknown }\\\end{array}$
Ending inventories:
Raw materials $\quad$$\$ 7,000$
WIP none
Finishedgoods $\quad$$\quad$$\quad$ 1,200units The total contribution margin under variable costing is:

A) $21,000
B) $34,500
C) $7,000
D) $33,000