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 1,300 units @ $4.20 1,400 units @ $4.40 1,600 units @ $4.50 1,200 units @ $4.60 4,200 units @ $6.10 If the company uses the weighted average inventory cost flow method, what is the average cost per unit (rounded) for May? Multiple Choice $4.43 $4.37 O $4.50 $6.10