At May 1, 2017, Bramble Corp. had beginning inventory consisting of 290 units with a unit cost of $7.0. During May, the company purchased inventory as follows: 590 units at $7.0 880 units at $8.0 The company sold 1470 units during the month for $12.0 per unit. Heineken uses the average cost method. The average cost per unit for May is