At May 1, 2020, Marigold Company had beginning inventory consisting of $160 units with a unit cost of $9.00. During May, the company purchased inventory as follows: 800 units at $9.00, 640 units at $10.00. The company sold 820 units during the month for $14.00 per unit. Marigold uses the average cost method. The average-cost per unit for May is>