Addison inc uses a perpetual inventory system, the following is information about one inventory item for the month of september:

sept 1. inventory 20 units at $25

4. sale 10 units

10 purchase 30 units at $30

17 sale 20 units

30 purchase 10 units at $35

use the information for Addison inc, if Addison uses the weighted average method what is the cost of merchandise sold for the September 17 sale?