please help me! I'm in a jam!

Tree Seedlings has the following current-year purchases and sales for its only product Date Activities Units Acquired at Cost Units Sold at Retail Jan. 1 Beginning inventory 80 units @ $2 = $ 160 Jan. 3 Sales 46 units @ $8 :54:33 Feb. 14 Purchase 112 units @ $3 = $ 336 Feb . 15 Sales 90 units @ $8 June 30 Purchase 130 units @ $4 - $ 520 Nov. 6 Sales 112 units @ $8 bok Nov . 19 Purchase 24 units @ $5 - $ 120 248 units ences Totals 346 units $1, 136 Required: The company uses a periodic 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