Information from the Records of the Scully Company for July

Information from the records of the Scully Company for July was as follows:
$\begin{array}{llr} \text { Sales } &\$307,500\\ \text { Selling and administrative expenses } &52,500\\ \text {Direct materials used } &66,000\\ \text { Direct labour } &75,000\\ \text { Variable factory overhead} &50,000\\ \text {Factory overhead } &51,250\\\end{array}$
$\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$ $\quad$$\text { Inventories }$
$\begin{array}{lrr}&\text {July 1}&\text {July 31}\\\text { Direct materials } & \$ 8,000 & \$ 10,500 \\\text { Work in process } & 18,750 & 21,000 \\\text { Finished goods } & 17,250 & 14,250\end{array}$
Scully Corporation produced 20,000 units.
-Refer to the figure.If production increases to 32,000 units next year,what will be the effect on variable product costs per unit and total product costs per unit,respectively?

A) remain the same; decrease
B) remain the same; remain the same
C) increase; remain the same
D) decrease; increase