Variable Costing Income Statement On April 30, the end of the first month of operations. Joplin Company prepared the following income statement, based on the absorption costing concept: $60,800 Joplin Company Absorption Costing Income Statement For the Month Ended April 30 Sales (3,800 units) Cost of goods sold: Cost of goods manufactured (4,400 units) 548,400 Inventory, April 30 (600 units) (6,600) Total cost of goods sold