Warrior Company needs a new processing machine. The company is considering 2 different machines: machine 0178 and machine 2216. Machine 0178 costs $20,000 and will reduce operating costs by $5,000 per year. Machine 2216 costs $15,000 and reduces operating costs by $3,000 per year. Compute the payback for each machine and determine which should be selected using the payback method.