Ivanhoe Company markets CDs of numerous performing artists. At the beginning of March, Ivanhoe Company had in beginning inventory 2,480 CDs with a unit cost of $7. During March, Ivanhoe Company made the following purchases of CDs. March 5 2,140$8 March 21 4,790$10 March 13 3,470$9 March 26 2,030 $11 During March 11,470 units were sold. Ivanhoe Company uses a periodic inventory system