Assume that three identical units of merchandisewere purchased during October, as follows:

			Units	Cost
October	5	Purchase	1	$5
	12	Purchase	1	13
	28	Purchase	1	15
Total			3	$33

One unit is sold on October 31 for $28. Using the table provided, determinecost of goods sold under the average cost method.

a. $22

b. $17

c. $13

d. $11