Doer Company produces a single product that sells for $ 120 per unit. Fixed expenses total $12,000 per month, and variable expenses are $ 80 per unit. The company's sales average 500 units per month. Which of the following statements is correct? The company's break-even point is $12,000 per month. The fixed expenses remain constant at $24 per unit for any activity level within the relevant range. The company's contribution margin ratio is 33%. The breakeven quantity is 400 units