Rory Company has an old machine with a book value of $75,000 and a remaining five-year useful life. Rory is considering purchasing a new machine at a price of $100,000. Rory can sell its old machine now for $77,000. The old machine has variable manufacturing costs of $32,000 per year. The new machine will reduce variable manufacturing costs by $12,800 per year over its five-year useful life. (a) Prepare a keep or replace analysis of income effects for the machines. (b) Should the old machine be replaced