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 $60Sales 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:Select one:a. $650b. $707c. $1,000d. $600