Payback Period The MHS Chief Financial Officer is considering alternate proposals for the hospital radiology department. The Director of Radiology has suggested purchasing one of two pieces of equipment. Machine A costs $15,000 and Machine B costs $12,000. Both machines are estimated to reduce radiology operating costs by $5,000 per year. Assume both machines have an useful life of 10 years. Required Which machine should be purchased? Make your payback calculations to provide the answer.