The units of Manganese Plus available for sale during the year were as follows: Mar. 1 June 16 Nov. 28 Inventory Purchase Purchase 20 units @ $31 $620 31 units @ $32 992 39 units @ $38 1,482 90 units $3,094 There are 13 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 $