4. Dorglass Incorporated reported the following information about the production and sale of its only product during the first month of operations: Selling price per unit $225 Sales $360,000 Direct materials used $176,000 Direct labor $100,000 Variable factory overhead $44,000 Fixed factory overhead $80,000 Variable selling and administrative expenses $20,000 Fixed selling and administrative expenses $10,000 Ending inventory, Direct Materials 0 Ending inventory, Work-in-process 0 Ending inventory, Finished Goods 400 units Under variable costing, the product cost per unit is