Gull corp. is considering selling its old popcorn machine and replacing it with a newer one. the old machine has a book value of $5,000, and its remaining useful life is five years. annual costs are $4,000. a high school is willing to buy it for $2,000. new equipment would cost $18,000 with annual operating costs of $1,500. the new machine has an estimated useful life of five years. should the machine be replaced? prepare a differential analysis report to support your answer