Is planning to sell 800 boxes of ceramic tile, with production estimated at 570 boxes during May. Each box of tile requires 44 pounds of clay mix and a 0.50 hour of direct labor. Clay mix costs $0.40 per pound and employees of the company are paid $19 per hour. Manufacturing overhead is applied at a rate of 110% of direct labor costs. Vaughn has 4200 pounds of clay mix in beginning inventory and wants to have 5500 pounds in ending inventory. what is the unit price per box of cermaic tile