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 1,100 units @ $3.80 1,200 units @ $4.00 1,400 units @ $4.10 1,000 units @ $4.20 3,600 units @ $5.70 Determine the amount of gross margin assuming the FIFO cost flow method. flow method. Multiple Choice $6,210 0 $6.840 $6,840 0 85.780 O $1310 $14.310