Required information Skip to question [The following information applies to the questions displayed below.] The Shirt Shop had the following transactions for T-shirts for 2016, its first year of operations: Jan. 20 Purchased 400 units @ $8 = $ 3,200 Apr. 21 Purchased 200 units @ $10 = 2,000 July 25 Purchased 280 units @ $13 = 3,640 Sept. 19 Purchased 90 units @ $20 = 1,800 During the year, The Shirt Shop sold 810 T-shirts for $20 each. c. Compute the difference in gross margin between the FIFO and LIFO cost flow assumptions