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When a certain 1.5-V batter is used to power a 3-W flashlight bulb, it is dead...

When a certain 1.5-V batter is used to power a 3-W flashlight bulb, it is dead after 71 minutes of use. If the battery costs $0.53, what is the cost of a kilowatt-hour of electric energy obtained in this way? Round to two decimal places, and do not include the dollar sign!

Math   Statistics-And-Probability   
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