Tree Seedlings has the following current-year purchases and sales for its only product. Units Sold at Retail Units Acquired at Cost 80 units @ $2 = $ 160 102 units @ $3 - $ 46 units @ $8 306 Date Activities Jan. 1 Beginning inventory Jan. 3 Sales Feb.14 Purchase Feb. 15 Sales June 30 Purchase Nov. 6 Sales Nov. 19 Purchase Totals 130 units @ $4 = $ 520 100 units @ $8 110 units @ $8 36 units @ $5 = $ 180 348 units $1,166 256 units Required: The company uses a perpetual inventory system. a. Determine the costs assigned to ending inventory and to cost of goods sold using FIFO. b. Determine the costs assigned to ending inventory and to cost of goods sold using LIFO. c. Compute the gross margin for each method