MDI Enterprises prepared the following income statement for June: $150,000 Sales revenue (6,000 units) Cost of goods sold: Fixed costs $18,000 Variable costs 30,000 Gross profit Operating expenses: Fixed costs 27,000 Variable costs 12,000 Operating income 48,000 102,000 39,000 $ 63,000 How much is MDI's total contribution margin? A) $120,000 B) $105,000 C) $108,000 D $93,000