Spahr Company produces a part that is used in the manufacture of one of its products. The unit manufacturing costs of this part, assuming a production level of 5,000 units, is shown in the table below. Erickson Company has offered to sell 5,000 units of the same part to Spahr Company for $11 per unit. Assuming the company has no other use for its facilities, what should Spahr Company do?

Direct materials	$2.00
Direct labor	$4.00
Variable manufacturing overhead	$2.00
Fixed manufacturing overhead	$4.00
Total cost	$12.00
The fixed overhead costs are unavoidable.

a.	Make the part and save $3 per unit

b.	Buy from Erickson and save $1 per unit.

c.	Make the part and save $2 per unit

d.	Make the part and save $7 per unit.