Econo-Cool air conditioners cost $350 to purchase, result in electricity bills of $160 per year, and last for 5 years. Luxury Air models cost $550, result in electricity bills of $120 per year, and last for 8 years. The discount rate is 21% a. What is the equivalent annual cost of the Econo-Cool model? (Do not round Intermediate calculations. Round your answers to 2 decimal places.) Econo-Cool Equivalent annual cost b. What is the equivalent annual cost of the Luxury Air model? (Do not round Intermediate calculations. Round your answers to 2 decimal places.) Luxury Alr Equivalent annual cost C. Which model is more cost-effective? Econo-Cool Luxury Air d-1. Now you remember that the inflation rate is expected to be 10% per year for the foreseeable future. What is the equivalent annual cost of the Econo-Cool and Luxury Air model? (Do not round Intermediate calculations. Round your answers to 2 decimal places.) Econo-Cool Luxury Air Equivalent annual cont d-2. Which model is more cost-effective? Econo-Cool Luxury Air