The inventory records for Radford Co. reflected the following Beginning inventory @ May 1 First purchase @ May 7 second purchase e May 17 Third. purchase @ May 23 Sales @ May 31 2,200 units @ $6.00 2,300 units $6.20 2,500 units $6.30 2,100 units e $6.48 6,900 units $7.90 Determine the weighted average cost per unit (rounded) for May