Hot Dog Express (HDE) is currently buying its buns from Buns-For-All for $0.70 per dozen. Each month, it purchases 14,500 dozen buns. HDE is considering making its own buns for cost-cutting and quality reasons. It has determined the following costs: materials, $0.20; direct labor, $0.10; variable factory overhead cost, $0.24; and total (existing) fixed costs, $3,100 per month. From an accounting point of view only, should HDE make or buy its buns? a. Buy; savings of $2,320 b. Make; savings of $7,050 c. Make; savings of $2,320 d. Buy; savings of $780