A company provided the below data for the month: Variable costs per unit: Line Item Description Amount Direct materials $6.00 Direct labor 2.00 Variable factory overhead 1.00 Variable selling expenses 0.60 Fixed factory overhead is $2,000 per month; it is applied to production based on normal activity of 1,000 units. During the month, 3,000 units were produced. The company started the month with 200 units in beginning inventory, with unit product cost equal to this month's unit product cost. A total of 1,200 units were sold during the month at a price of $15. Selling & administrative expense for the month, Jall fixed, totaled $2,400. What is the unit product cost under variable costing?