Tree Seedlings has the following current-year purchases and sales for its only product. 1 Units sold at Retail Units Acquired at Cost 230 units $2$ 460 138 units 372 units $3 = $1,116 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 250 units $8 280 units $4 - $1,120 220 units es 96 units $5 - $ 480 978 units $3,176 608 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