help with this practice problem thank you!

Flint Distribution markets CDs of numerous performing artists. At the beginning of March, Flint had in beginning inventory 2,700 CDs with a unit cost of $ 6. During March, Flint made the following purchases of CDs. March 5 3,375 @ $7 March 21 6,050 @ $9 March 13 4.725 @ $8 March 26 3,400 @ $10 During March 15,000 units were sold. Flint uses a periodic inventory system Calculate weighted average cost per unit. (Round answer to 3 decimal places, eg. 2.257.) Weighted average cost per unit $