Air conditioners cost $300 to purchase, result in electricity bills of $150 per year, and last for 5 years. The discount rate is 20 percent. Should you replace your current air conditioner which costs $270 per year to run?

A: Do not replace - the equivalent annual cost of the new AC is $350

B: Replace - the equivalent annual cost of the new AC is $210

C: Do not replace - the equivalent annual cost of the new AC is $330

D: Replace - the equivalent annual cost of the new AC is $150

E: Replace - the equivalent annual cost of the new AC is $250