Periodic inventory using FIFO, LIFO, and weighted average cost methods The units of an item available for sale during the year were as follows: Date Line Item Description Units Cost per Unit Amount Jan. 1 Inventory 19 units at $24 $456 Aug. 13 Purchase 4 units at $25 100 Nov. 30 Purchase 17 units at $27 459 Available for sale 40 units $1,015 There are 24 units of the item in the physical inventory at December 31. The periodic inventory system is used. Determine the inventory cost using the (a) first-i