fulbright corporation uses the periodic inventory system. during its first year of operations, fulbright made the following purchases (listed in chronological order of acquisition): 40 units at $100 per unit 70 units at $80 per unit 170 units at $60 per unit sales for the year totaled 270 units, leaving 10 units on hand at the end of the year. ending inventory using the average cost method (rounded) is: