The units of Product B available for sale during the year were as follows: May 1 Inventory 25 units @ $32 July 16 Purchase 32 units a $34 Sept 28 Purchase 42 units @ $36 There are 45 units of the product in the physical inventory at September 30. The periodic inventory system is used. Determine the cost of goods sold by (a) FIFO, (b) LIFO, and (c) average cost methods