A 200 – W computer power supply is on 10 hours per day. If the cost of electricity is $0.15/kWh, what is the cost (to the nearest dollar) to run the computer every day for a year (365 days)?

Answer 1

.2 kw * 10 = 2 kw hr per day
times 365 = 730 kw hr per year
times .15 dollar/kw hr = $109.50 per year
= $110 rounded to nearest dollar