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The units of Manganese Plus available for sale during the year were as follows: $750 957 Mar. 1 Inventory 25 units @ $30 June 16 Purchase 29 units @ $33 Nov. 28 Purchase 41 units @ $38 95 units 1,558 $3,265 There are 11 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