The inventory records for Radford Company reflected the following Beginning inventory on May 1 100 units @ $4.00 First purchase on May 7 300 units @ $4.40 second purchase on May 17 500 units @ $4.60 Third purchase on May 23 100 units @ $4.80 Sales on May 31 900 units @ $7.80 What is the amount of cost of goods sold assuming the LIFO cost flow method is used? $3,600 $4,320 $2,360 $4,100