n 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 (6,000 units) $102,000 Cost of goods sold: Cost of goods manufactured (6,900 units) $82,800 Inventory, April 30 (1,000 units) (12,000) Total cost of goods sold (70,800) Gross profit $31,200 Selling and administrative