The TechGuide Company produces and sells 7,500 modular computer desks per year at a selling price of $750 each. Its current production equipment, purchased for $1,800,000 and with a five-year useful life, is only two years old. It has a terminal disposal value of $0 and is depreciated on a straight-line basis. The equipment has a current disposal price of $450,000. However, the emergence of a new molding technology has led TechGuide to consider either upgrading or replacing the production equipment. The following table presents data for the two alternatives: Upgrade $3,000,000 $ 150 One-time equipment costs Variable manufacturing cost per desk Remaining useful life of equipment Terminal disposal value of equipment Replace $4,800,000 $ 75 3 yrs $0 3 yrs $ 0. All equipment costs will continue to be depreciated on a straight-line basis. Should TechGuide upgrade its production line or replace it? Show your calculations