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An LED lightbulb, taking in 30 W of power, can produce the same level of brightness...

An LED lightbulb, taking in 30 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 $4.00, whereas the conventional bulb has lifetime 750 h and costs $0.708 per bulb. Determine the total savings (in dollars) obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. The current energy cost for residential electricity in San Diego is about $0.16 per kW-hr.

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