A manager is trying to decide whether to purchase a certain part or to have it produced internally. Internal production could use elther of two processes. One would entail a variable cost of $17 per unit and an annual fixed cost of $200,000; the other would entail a varlable cost of $14 per unit and an annual flxed cost of $240,000. Three vendors are willing to provide the part Vendor A has a price of $20 per unit for any volume up to 30,000 units. Vendor B has a price of $22 per unit for demand of 1,000 units or less, and $18 per unit for larger quantities. Vendor C offers a price of $21 per unit for the first 1,000 units, and $19 per unit for additional units. a. If the manager anticlpates an annual volume of 10,000 units, which alternative would be best from a cost standpoint? For 20,000 units, which aitemative would be best? b. Determine the range for which each alternative is best