Hemming Co. reported the following current-year purchases and sales data for its only product. Units Acquired at Cost Date Activities Units Sold at Retail Jan. 1 Beginning inventory 170 units $12.80 2,176 Jan. 10 Sales 160 units @$42.80 Mar. 14 Purchase 320 units $17.80 5,696 Mar. 15 Sales 210 units @$42.80 470 units $22.80 10,716 July 30 Purchase Oct. 5 Sales 230 units @$42.80 670 units $27.80 18,626 Oct. 26 Purchase $37,214 600 units Totals 1,630 units Required: Hemming uses a periodic inventory system (a) Determine the costs assigned to ending inventory and to cost of goods sold using FlFO. (b) Determine the costs assigned to ending inventory and to cost of goods sold using LIFO. (c) Compute the gross margin for each method