The units of Manganese Plus available for sale during the year were as follows: Mar 1 22 units Inventory Purchase Purchase $29 $32 $638 960 June 16 Nov. 28 30 units $39 46 units 98 units 1,794 $3,392 There are 16 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