The units of Manganese Plus available for sale during the year were as follows: Mar. 1 22 units Inventory Purchase $29 $33 $638 957 June 16 29 units Nov. 28 Purchase 42 units $38 1,596 $3,191 93 units There are 14 units of the product in the physical inventory 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