Check Beginning inventory & May 1 First purchase e 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 What is the amount of gross margin assuming the weighted-average inventory cost flow method? (Round your intermediate calculations to two decimal places.) Multiple Choice $5.400 $9,360 $6,012 $15,120