D'Souza Company sold 5,500 units of its product for $89 per unit. Each unit had $51.80 in variable cost of goods sold and $10.90 in variable selling and administrative expenses. Compute contribution margin. D'Souza Company sold 5,500 units of its product for $89 per unit. Each unit had $51.80 in variable cost of goods sold and $10.90 in variable selling and administrative expenses. Compute contribution margin