Periodic Inventory by Three Methods The units of an item available for sale during the year were as follows: Jan. 1 Inventory 15 units @$36 Feb. 17 Purchase 12 units @$37 Jul. 21 Purchase 5 units @$38 Nov. 23 Purchase 13 units @$38 There are 18 units of the item in the physical inventory at December 31. The periodic inventory system is used. Round average unit cost to the nearest cent and final answers to the nearest whole dollar, if required Determine the inventory cost by the first first-out method. $______ Determine the inventory cost by the last-in, first-out method. $______ Determine the inventory cost by the weighted average cost method. $______