The inventory records for Radford Co. reflected the following Beginning inventory @ May 1 First purchase @ May 7 second purchase @ May 17 Third purchase @ May 23 Sales @ May 31 500 units $2.60 600 units $2.80 800 units $2.90 400 units $3.00 1,800 units $4.50 Determine the amount of gross margin assuming the FIFO cost flow method. Multiple Choice $3,090 $3.420