51 Vaughn, Inc. sold 12,000 units last year for $40.00 each. Variable costs per unit were 58.00 for direct materials, 18.00 for creation and $200 for variable overhead. Fixed costs were 134.000 in manufacturing overhead and $21.000 in nonmanufacturing costs a. What is the total contribution margin? Tout cantion Margin b. What is the unit contribution margin? Unit Contribution Margin c. What is the contribution margin ratio? Contribution Margin Ratio %