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An energy-efficient lightbulb, taking in 25.0 W of power, can produce the same level of brightness...

An energy-efficient lightbulb, taking in 25.0 W of power, can produce the same level of brightness as a conventional lightbulb operating at power 100 W. The lifetime of the energy-efficient bulb is 10 000 h and its purchase price is $4.80, whereas the conventional bulb has lifetime 750 h and costs $0.54 per bulb. Determine the total savings obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. Assume an energy cost of $0.20 per kilowatt-hour?

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