accounts help!!!!!!!!

accounts help!!!!!!!!

Question
	
(1) ABC corp. uses the periodic inventory system. During its first year of operation, ABC made the following purchases ( listed in chronological order of acquisition):

40 units at $100;

70 units at $80; and

170 units at $60

Sales for the year totaled $270 units, leaving 10 units on hand at the end of the year. What is the ending inventory using the average cost method (rounded)?