Suppose that the cost of electrical energy is $0.12 per kilowatt hour and that y

Question

Suppose that the cost of electrical energy is $0.12 per kilowatt hour and that your electric bill for 30 days is $60 (power usage only, not including other charges or taxes) Assume that the power delivered is constant over the entire 30 days. What is the power in watts? If a voltage of 120 V supplies this power, what current flows? Part of your electrical load is a 60-W light that is on continuously. By what percentage can your energy consumption be reduced by turning this light off?

I ONLY NEED THE LAST PART. The final answer is 8.64% but i cant get to it.

Explanation / Answer

cost of electrical energy is $0.12 per kilowatt hour electric bill for 30 days is $60 power =60/0.12*30*24=25/36KW=694.45W V=120V I=25000/36*120=5.78A electrical load is a 60-W light R=120^2/60=240ohm so power of load=60W so if it is off = then energy cunsuomption cab be reduced by =60W so % change= [60/694.45]*100=8.64%

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