Swell Computers has 12 obsolete computers in its inventory that cost $13,200 to produce. If these computers are upgraded at a cost of $7,500, they can be sold for $15,300. Alternatively, the computers can be sold "as is" for $9,000. What is the net advantage or disadvantage of upgrading the computers? 1 $6,300 advantage. 2. $1,200 disadvantage 3 $5,400 disadvantage 4 $3,000 advantage