GR Company uses 8,000 units of a certain part in production each year. Presently, this part is purchased from an outside supplier at $12 per unit. For some time, there has been idle capacity in GR's factory that could be utilized to make this part. If GR decides to make the part, there would be an increase of $12,000 in fixed manufacturing costs for the salary of a new supervisor. The following information has been assembled on the unit costs of making this part internally: Suppose the idle capacity (floor space and machinery) is presently being rented to another company for $32,000 per year. All the other conditions are still the same. If GR chooses to make the part instead of buying it outside, the net advantage or disadvantage (per year) would be: Multiple Choice $4,000 advantage $15,000 disadvantage $52,000 advantage $12,000 disadvantage $10,000 advantage