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 $20

Sept 4 sale 10 units

Sept 10 purchase 30 units at $25

Sept 17 sale 20 units

Sept 30 purchase 10 units at $30

use the information for addison, inc. if addison uses lifo, the cost of the ending merchandise inventory on september 30

a. $700

b. $800

c. $750

d. $650