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 $150,000, they can be sold for a total of $210,000. as an alternative, the computers can be sold in thier present condition for $40,000. suppose the selling price of the upgraded computers has not been set. at what selling price per unit would the company be as well off upgrading the computers as if it hust sold the computers in their present condition? $75 $308 $475 $160