The units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 21 units @ $31 $651 June 16 Purchase 28 units $35 980 Nov. 28 Purchase 44 units @ $36 1,584 93 units $3,215 There are 18 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. FIFO Cost of Goods Sold LIFO Cost of Goods Sold Difference $