The Shirt Shop had the following transactions for T-shirts for Year 1, its first year of operations. Jan. 20 Purchased 410 units $12= $4,920 Apr. 21 Purchased 130 units $13= 1,690 July 25 Purchased 230 units $14= 3,220 Sept. 19 Purchased 80 units $15 = 1,200 During the year, The Shirt Shop sold 680 T-shirts for $20 each. Required a. Compute the amount of ending inventory The Shirt Shop would report on the balance sheet, assuming the following col flow assumptions (1) FIFO, (2) LIFO, and (3) weighted average b. Compute the difference in gross margin between the FIFO and LIFO cost flow assumptions.