Please explain the calculations

Rory Company has an old machine with a book value of $79,000 and a remaining five-year useful life. Rory is considering purchasing new machine at a price of $107,000. Rory can sell its old machine now for $88,000. The old machine has variable manufacturing costs of $35,000 per year. The new machine will reduce variable manufacturing costs by $14,000 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? Complete this question by entering your answers in the tabs below. Prepare a keep or replace analysis of income effects for the machines