An elevator system in an office building can either be left alone, refurbished or replaced. Refurbishing the elevators will cost $55,000 and extend the life of the elevators another 20 years. Annual maintenance costs will be $1,000 per year. Replacing the elevator system will cost $128,000, with an expected life of 40 years. Maintenance costs will be $400 per year. Current maintenance costs are $5,500 per year. Using a MARR of 4%, which alternative would you recommend