Green Company Produces 1,000 Parts Per Year,which Are Used in the Assembly

Multiple Choice

Green Company produces 1,000 parts per year,which are used in the assembly of one of its products.The unit product cost of these parts is:
$\begin{array}{|l|r|}\hline \text { Variable Manufacturing Cost } & \$ 12 \\\hline \text { Fixed Manufacturing Cost } & \$ 9 \\\hline \text { Unit Product Cost } & \$ 21 \\\hline\end{array}$
The part can be purchased from an outside supplier for $20 per unit.If the part is purchased from the outside supplier,two-thirds of the fixed manufacturing costs can be eliminated.What will be the annual impact on the company's operating income of buying the part from the outside supplier? (Do not round intermediate calculations.)

A) $1,000 increase.
B) $1,000 decrease.
C) $2,000 decrease.
D) $5,000 increase.