Bridgeport-Mart Centre Inc. opened for business on May 1, and uses a perpetual inventory system. During May, the company had the following purchases and sales for one of its products: Purchases Sales Date Units Unit Cost Units Unit Price May 120 $100 80 $245 100 110 13 80 269 15 60 116 20 60 294 27 40 319 find cost of goods sold by FIFO and average cost. a) cost of goods sold b) ending inventory