The units of an item available for sale during the year were as follows:

                    Jan.   1               Inventory         1,000 units at $15
                    Feb.  17             Purchase          1,375 units at $16
                    July   21             Purchase          1,500 units at $17
                    Nov.  23             Purchase          1,125 units at $18

There are 1,100 units of the item in the physical inventory at December 31. The periodic
inventory system is used. Determine the inventory cost by the (A) first-in, first-out method,
(B) last-in, first-out method, and (C) weighted average cost method.