Tawstir Corporation has 800 obsolete Personal Computers that are carried in inventory at a total cost of $1, 100,000.If these computers are upgraded at a total cost of $40,000 for a total of $750,000 As an alternative, the computers can be sold in their present condition for $690,000.The sunk cost in this situation is: $690,000 $1, 1000,000 $750,000 $40,000