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 $600 Mar. 3 Purchase 250 $1.750 Mar. 5 Sale 210 $14/unit Mar. 13 Purchase 150 $1,200 Mar. 15 Sale 50 $14/unit Mar. 28 Sale 120 $14/unit For each of the following, type the dollar amount (nearest dollar without dollar sign ($) 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 Gross profit for March