Problem B: EI, COGS, and GM under LIFO, FIFO, and WA William Company uses the periodic inventory system and the accounts reflected the following data: End Inu cunots) GAFS -units sold Units Amount Beginning inventory 6,000 $ 30,000 Purchases 32,000 192,000 Sales 28.000 280,000 6006 302 ooo Compute the following using the FIFO, LIFO, and Weighted Average inventory methods: FIFO LIFO I WA Ending Inventory COGS $ Gross Margin