1. 
Devin's bill from EdHelper Electricity and Company was for a total of $124.87. EdHelper Electricity and Company charges 8.8 cents per kilowatthour. The total bill also included nonenergy related taxes and fees of $8.18. How many kilowatthours did Devin purchase?


2. 
A sixtywatt incandescent bulb costs $0.75 and has an estimated life of 760 hours. An equivalent fifteenwatt compact fluorescent bulb costs $16.20 and has an estimated life of 9,120 hours. The current cost of electricity is $0.12 per kilowatthour. During a period of 9,120 hours, how much will be saved by using the fluorescent bulb?


3. 
Shelby likes to run the air conditioner every day from 10:00 a.m. to 9:00 p.m. The air conditioner uses 1,300 watts of power. The current cost of electricity is $0.09 per kilowatthour. If Shelby uses the save energy switch on the air conditioner, the air conditioner will turn off automatically for 40% of the time that it is on. During a one week period, how much would Shelby save if she uses the save energy switch?


4. 
Savannah's radio uses fiftyeightwatts of power. If Savannah plays the radio from 3:46 p.m. to 6:53 p.m., how many kilowatts will the radio use?

