A retailer uses a first-in, first-out cost determination method in a perpetual inventory system For the current month, the following purchase and sales transactions occurred: Date Description Units Total Selling Cost Price Mar. 1 Opening inventory 100 $700 Mar. 3 Purchase 200 $1,600 Mar. 5 Sale 160 $15/unit Mar. 13 Purchase 150 $1,350 Mar. 15 Sale 80 $15/unit 90 Mar. 28 Sale $15/unit For each of the following, type the dollar amount (nearest dollar without dollar sign ($) or comma, e.g. 15000)? Mar. 5 cost of goods sold Mar. 15 cost of goods sold Mar. 28 cost of goods sold Ending inventory, March 31 NE Gross profit for March