Calculator Addison, Inc. uses a perpetual inventory system. Below is information about one inventory item for the month of September Sep. 1 Inventory 4 Sold 10 Purchased 17 Sold 30 Purchased 20 units at $20 10 units 30 units at $25 20 units 10 units at $30 If Addison uses the weighted average cost method, what is the inventory balance at the end of September? Ca. $1,150.00 b. $1,375.00 c. $1,500.00 d. $1,187.50