Abacus has 800 obsolete calculators that are carried in inventory at a fixed cost of $1,920. If these calculators are upgraded at a cost of $3,100, they could be sold for $4,500. Alternatively, the calculators could be sold "as is" for $1,600. What is the net advantage or disadvantage of reworking the calculators? Answer: A:s B: 3 C: $ D: 5 The company (answer "should" or "should not") upgrade the calculators before selling them