Based on the Following Cost Data,items Labeled (A)and (B)in the Table

Based on the following cost data,items labeled (a) and (b) in the table below are which of the following amounts,respectively? $\begin{array}{|l|r|r|}\hline \text { Number of units: } & 1,500 & 3,000 \\\hline \text { Total cost: } & & \\\hline \text { Vanable } & \$ 7,500 & \$ 15,000 \\\hline \text { Fixed } & \$ 6,000 & \$ 6,000 \\\hline & & \\\hline \text { Cost per unit: } & & \\\hline \text { Vanable } & \$ 5 & \text { (a) } \\\hline \text { Fixed } & \$ 4 & \text { (b) } \\\hline\end{array}$

A) (a) = $3.00;(b) = $3.00
B) (a) = $5.00;(b) = $4.00
C) (a) = $2.50;(b) = $2.00
D) (a) = $5.00;(b) = $2.00