Name _____________________________ Date ___________________
 Earth Day
Complete

 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 kilowatt-hour. The total bill also included non-energy related taxes and fees of \$8.18. How many kilowatt-hours did Devin purchase?
 2 A sixty-watt incandescent bulb costs \$0.75 and has an estimated life of 760 hours. An equivalent fifteen-watt compact fluorescent bulb costs \$16.20 and has an estimated life of 9,120 hours. The current cost of electricity is \$0.12 per kilowatt-hour. 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 kilowatt-hour. 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 fifty-eight-watts of power. If Savannah plays the radio from 3:46 p.m. to 6:53 p.m., how many kilowatts will the radio use?