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: Joplin Company Absorption Costing Income Statement For the Month Ended April 30 Sales (5,400 units) $135,000 Cost of goods sold: Cost of goods manufactured (6,300 units) $113,400 Inventory, April 30 (900 units) (16,200) Total cost of goods sold (97,200) Gross profit $37,800 Selling and administrative expenses (21,320) Operating income $16,480 If the fixed manufacturing costs were $22,680 and the fixed selling and administrative expenses were $10,440, prepare an income statement according to the variable costing concept