he units of Manganese Plus available for sale during the year were as follows: Mar. 1 Inventory 20 units @ $30 $600 June 16 Purchase 31 units $31 961 Nov. 28 Purchase 46 units $38 1,748 97 units $3,309 There are 14 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