High Fidelity Audio Inc. reported sales of $8,000,000 for the month and incurred variable expenses totaling $5,600,000 and fixed expenses totaling $1,440,000. The company has no beginning or ending inventories. A total of 80,000 units were produced and sold last month. What is the company's degree of operating leverage? a) 0.12 b) 0.4 c) 2.5 d) 3.3