Dodero Company produces a single product which sells for $100 per unit. Fixed expenses total $12,000 per month, and variable expenses are $60 per unit. The company's sales average 500 units per month. Which of the following statements is correct? a.The company's break-even point is $12,000 per month. b. The fixed expenses remain constant at $24 per unit for any activity level within the relevant range. c. The company's contribution margin ratio is 40%. d. Responses A, B, and C are all correct. please show work