The following is Hawkin Corporation's contribution format income statement for last month: Sales Less variable expenses Contribution margin Less fixed expenses Net income $800,000 400,000 400,000 300,000 $100,000 The company has no beginning or ending inventories. The company produced and sold 20,000 units last month. 1. What is the company's contribution margin ratio? (1 mark) 2. Explain the contribution margin ratio calculated? (1 mark) 3. What is the per unit selling price, variable expense and contribution margin? (3 marks) 4. If 3 units were sold what is the total contribution in dollars to contribute to fixed expenses and operating expenses. (1 mark)