d) $492,550. 15. Fulbright Corp. 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 70 units at $80 170 units at $60 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: a) S650 b) $1,000. c) $707. d) $600