The units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 22 units $682 June 16 Purchase 32 units $31 @ $35 @ $36 Nov. 28 Purchase 45 units 1,120 1,620 $3,422 99 units There are 11 units of the product in the physical irwentory at November 30. The periodic Inventory system is used. Round answers to the nearest whole dollar. 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