35. Replacement decisions. (S6.4) A forklift will last for only two more years. It costs $5,000 a year to maintain. For $20,000 you can buy a new forklift that can last for 10 years and should require maintenance costs of only $2,000 a year. a. If the discount rate is 4% per year, should you replace the forklift? b. What if the discount rate is 12% per year