Required information [The following information applies to the questions displayed below.] 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 5ee units @ $2.60 600 units @ $2.80 890 units @ $2.90 400 units @ $3.ee 1,880 units @ $4.50 If the company uses the weighted average Inventory cost flow method, what is the average cost per unit (rounded) for May? What is the amount of cost of goods sold assuming the LIFO cost flow method? What is the amount of ending Inventory assuming the FIFO cost flow method? What is the amount of gross margin assuming the weighted-average Inventory cost flow method? (Round your Intermediate calculations to two decimal places.) What is the amount of gross margin assuming the FIFO cost flow method