*E6.17 ( LO7 ) AP Dene Company uses a periodic inventory system and its accounting records include the following inventory information for the month of July: A physical inventory count determined that 620 units were on hand at July 31 . Instructions a. Calculate the ending inventory and the cost of goods sold under (1) FIFO and (2) weighted average. b. For item 2 of part (a), explain why the weighted average unit cost is not $6.25