9. You are considering replacing an existing machine that you purchased five years ago when it cost $130,000. If you keep this machine it will last for nine more years. A newer, more efficient machine that will also last for nine years could be purchased today for $260,000. If you purchased the new machine, you would sell the existing machine for only $40,000. The existing machine would cost you $90,000 per year to operate while the new machine would only cost you $40,000 per year to operate. At the end of nine years, the old machine would be worth only $10,000, while you could sell the more efficient machine for $40,000 at that time. No matter which machine you use (and you must use one of them), the revenues will be $600,000 per year. Ignore income taxes!! a. Using Net Present Value (NPV) analysis, should you replace the old machine with the more efficient machine if your required rate of return is 14% per year b. At what required rate of return would you be indifferent between the two choices