A forklift will last for only 2 more years. It costs $6,600 a year to maintain. For $21,000 you can buy a new lift can last for 10 years and should require maintenance costs of only $3,600 a year. a-1. Calculate the equivalent cost of owning and operating the forklift if the discount rate is 6% per year. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. a-2. Should you replace the forklift? b-1. Calculate the equivalent cost of owning and operating the forklift if the discount rate is 15% per year. Note: Do not round intermediate calculations. Round your answer to 2 decimal places. b-2. Should you replace the forklift