William Company uses the periodic inventory system and has provided the following data: Beginning inventory Purchases Sales Units 6,000 32.000 28,000 Amount $ 30,000 192,000 280.000 Required: A Caloulate the following using both: FIFO and LIFO inventory methods FIFO LIFO 1. Ending inventory 2. Cost of Goods Sold 3. Gross profit B. In times of rising unit costs, how does pretax income using FIFO compare to pretax income using LIFO? Explain your