24. The units of an item available for sale during the year were as follows: January 10 Inventory 27 units@$90 February 27 Purchase 54 units @$98 July 11 Purchase 63 units@ $106 November 13 Purchase36 units$115 There are 50 units of the item in the physical inventory at December 31. The periodic inventory system used. Determine the ending inventory cost by (a) the first-i and (c) the average cost method. Show your work. n, fi irst-out method, (b) the last-in, first-out method