The units of Manganese Plus available for sale during the year were as follows: $640 Mar. 1 June 16 Nov. 28 Inventory Purchase Purchase 961 20 units @ $32 31 units @ $31 42 units @ $37 93 units 1,554 $3,155 There are 12 units of the product in the physical inventory at November 30. The periodic inventory system is used. 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 weighted average cost methods. Round intermediate calculations and final answer to two decimal places