Tawstir Corporation has 400 obsolete personal computers that are carried in inventory at a total cost of $576,000. If these computers are upgraded at a total cost of $110,000, they can be sold for a total of $170,000. As an alternative, the computers can be sold in their present condition for $40,000. What is the net advantage or disadvantage to the company from upgrading the computers rather than selling them in their present condition? $130,000 advantage $570,000 disadvantage O $60,000 advantage O $20,000 advantage