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Answer:a. FIFO COGS $ 17640a. FIFO Ending Inventory $ 12960b. LIFO COGS $ 19160b. LIFO ending Inventory $ 11440c. Weighted COGS $ 18360c.Weighted Ending Inventory $12240Explanation:Cortez CompanyParticulars Units unit Cost Total CostOpening Inventory 100 $ 60 $ 6000Purchases 150 $ 68 10200Batch 2 200 $ 72 $ 14400Total 450 $30600FIFO means first units received will be sold out first and the ending inventory consists of last units.Sales = 270 unitsa. FIFO COGS $ 17640100 units at $ 60 = $ 6000150 units at $ 68 = 1020020 units at $ 72 = $1440a. FIFO Ending Inventory $ 12960180 units at $ 72 =$ 12960LIFO means last units received will be sold out first and the ending inventory consists of first units.b. LIFO COGS $ 19160200 units at $ 72 = $ 1440070 units at $ 68 = 4760b. LIFO ending Inventory $ 11440100 units at $ 60= $ 600080 units at $ 68 = 5440c. Weighted Average Cost = Total Cost/ No of units = $30600 /450= $ 68c. Weighted COGS = 270 units at $ 68= $ 18360c. Weighted Ending Inventory= (Total Units - Sales) CP per unit= (450- 270)* 68= 180 *68=$12240...