The units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 20 units @ $31 $620 June 16 Purchase 33 units @ $35 1,155 Nov. 28 Purchase 46 units @ $37 1,702 99 units $3,477 There are 18 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