A refrigerator has a 1000 W compressor, but the compressor runs only 20% of the time.
a. If electricity costs $0.10/kWh, what is the monthly (30 day) cost of running the refrigerator?
b. A more energy efficient refrigerator with an 800 W compressor costs $100 more. If you buy the more expensive refrigerator, how many months will it take to recover your additional cost?