Dr. T uses her computer 10 hours 5 days each week during the school year. If the power rating of her computer is 75 W and the cost of one kilowatt'hour is $0.12, How much does it cost for Dr. T to use her computer for the school year? A typical school year is 180 days. Here is what we know: 75 W 1000 W = 1kw 5 hours per day 130 days per school year Energy cost = $0.12 per kw*hour