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The units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 22 units$30 $660 899 1,672 $3,231 June 16 Purchase 29 units $31 Nov. 28 Purchase 44 units$38 95 units There are 15 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