15. Stone Company reported the following information about the production and sale of its only product during the first month of operations: Selling price per unit Sales Direct materials used Direct labor Variable factory overhead Fixed factory overhead Variable selling and administrative expenses Fixed selling and administrative expenses Ending inventory, Direct Materials Ending inventory, Work-in-process Ending inventory, Finished Goods $300 $480,000 $220,000 $200,000 $60,000 $80,000 $20,000 $10,000 0 0 400 units Under variable costing, the cost of finished goods ending inventory is A) $64,000 B) $68,000 C) $96,000 D) $100,000