The inventory records for Radford Company reflected the following Beginning inventory on May 1 1,900 units @ $5.40 First purchase on May 7 2,000 units @ $5.60 Second purchase on May 17 2, 200 units @ $5.70 Third purchase on May 23 1, 800 units @ $5.80 Sale on May 31 6,000 units @ $7.30 What is the amount of gross margin assuming the FIFO cost flow method is used? Multiple Choice O $9,620 O $11,400 O $10,370 O $33,430