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The units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 23 units @ $29 $667 June 16 Purchase 33 units @ $32 1,056 Nov. 28 Purchase 42 units @ $39 1,638 98 units $3,361 There are 17 units of the product in the physical inventory at November 30. The periodic inventory system is used. Determine the difference in gross profit between the LIFO and FIFO inventory cost systems. Enter the answer as a positive number