Please explain

Required Information Problem 5-1AA Periodic: Alternative cost flows LO P1 The following information applies to the questions displayed below.] Warnerwoods Company uses a periodic inventory system. It entered into the following purchases and sales transactions for March Activities Units Acquired at Cost 175 units $65 per unit 475 units $70 per unit Units Sold at Retail Date 1 Beginning inventory 5 Purchase Mar. Mar. 495 units $1e0 per unit Mar. 9 Sales 27e units $75 per unit 350 units $77 per unit 18 Purchase Mar. 25 Purchase Mar. 310 units@$110 per unit Mar. 29 Sales 885 units 1,270 units Totals For specific identification, the March 9 sale consisted of 80 units from beginning inventory and 415 units from the March 5 purchase: the March 29 sale consisted of 115 units from the March 18 purchase and 195 units from the March 25 purchase. Weighted Average Specific Identification FIFO LIFO Sales Less: Cost of goods sold Gross profit 0 s