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A forklift will last for only 2 more years. It costs $6,800 a year to maintain. For $23,000 you can buy a new lift that can last for 10 years and should require maintenance costs of only $3,800 a year. a-1. Calculate the equivalent cost of owning and operating the forklift if the discount rate is 4% per year. (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. (Do not round intermediate calculations. Round your answer to 2 decimal places.) b-2. Should you replace the forklift? a-1. Equivalent cost a-2. Should you replace the forklift? b-1. Equivalent cost b-2. Should you replace the forklift