Econo$-$Cool air conditioners cost $$355$ to purchase, result in electricity bills of $$161$ per year, and last for $5$ years. Luxury Air models cost $$555,$ result in electricity bills of $$122$ per year, and last for $8$ years. The discount rate is $20\%.$

a$.$ What is the equivalent annual cost of the Econo$-$Cool model?

Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

b$.$ What is the equivalent annual cost of the Luxury Air model?

Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.

c$.$ Which model is more cost$-$effective?

multiple choice $1$

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 are the equivalent annual cost of the Econo$-$Cool and Luxury Air model?

Note: Do not round intermediate calculations. Round your answers to $2$ decimal places.

d$-2.$ Which model is more cost$-$effective?

multiple choice $2$

Econo$-$Cool

Luxury Air