Assume that three identical units of merchandise were 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, what is the cost of goods sold under the LIFO method? Oa. 18 Ob. si3 Oc. 528 Od 15