Calculate average cost per unite

Coronado Company had a beginning inventory on January 1 of 190 units of Product 4-18-15 at a cost of $20 per unit. During the year, the following purchases were made. Mar. 15 450 units at $23 Sept. 4 350 units at $25 July 20 230 units at $24 Dec. 2 100 units at $26 1,115 units were sold. Coronado Company uses a periodic inventory system