Determine the cost of goods sold for the transaction on September 25 using the perpetual inventory system and the FIFO method. Date Item Units Cost Total 5 $5 $25 Beginning inventory Purchase 00 8 6 48 Sale 6 September 4 September 8 September 20 September 25 Purchase 15 7 105 Sale 12 O a. $84 O b. $105 O c. $77 Od: $73