A forklift will last for only $2$ more years. It costs $$5,600$ a year to maintain. For $$22,000$ you can buy a new lift that can last for $10$ years and should require maintenance costs of only $$2,600$ a year.

a$-1.$ Calculate the equivalent cost of owning and operating the forklift if the discount rate is $5\%$ 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?