Required information [The following information applies to the questions displayed below] The Shirt Shop had the following transactions for T-shirts for 2018, its first year of operations: Jan. 20 Purchased 330 units $10 $11 $13 $14 $3,300 Apr. 21 July 25 Sept. 19 Purchased Purchased 80 units 210 units 880 Purchased 2,730 60 units 840 During the year, The Shirt Shop sold 520 T-shirts for $19 each. b. Compute the gross margin using the FIFO cost flow assumption. FIFO Gross margin