The units of Manganese Plus available for sale during the year were as follows: Mar. 1 25 units $775 Inventory Purchase @ $31 @ $33 June 16 31 units 1,023 1,480 Nov. 28 Purchase 40 units @ $37 96 units $3,278 There are 13 units of the product in the physical inventory at November 30. The periodic inventory system is used. a. Determine the inventory cost by the FIFO method. b. Determine the inventory cost by the LIFO method. $ c. Determine the inventory cost by the average cost methods. Round answer to two decimal places. $