The following is Snow Corporation's contribution format income statement for last month: The company has no beginning or ending inventories and produced and sold 20,000 units during the month. Required: 1. What is the company's contribution margin ratio? 2. What is the company's break-even in units? 3. How many units would the company have to sell to attain target operating income of $125,000 ? 4. What is the company's margin of safety in dollars