Miller Company produces speakers for home stereo units. The speakers are sold to retail stores for $30. Manufacturing and other costs are as follows: The variable distribution costs are for transportation to the retail stores. The current production and sales volume is 20,000 per year. Capacity is 25,000 units per year. A Tennessee manufacturing firm has offered a one-year contract to supply speakers at a cost of $17.00 per unit. If Miller Company accepts the offer, it will be able to rent unused space to an outside firm for $18,000 per year. All other information remains the same as the original data. What is the effect on profits if Miller Company buys from the Tennessee firm? a. increase of $8.000 b. increase of $9,000 c. decrease of $6,000 d. decrease of $8,000