A certain 100-watt light bulb costs 75 cents and lasts for


A certain 100-watt light bulb costs 75 cents and lasts for 120 hours. Another longer-lived 100-watt light bulb costs $1.20. How much longer would the more expensive bulb have to last to make it a "good buy"?

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Electrical Engineering: A certain 100-watt light bulb costs 75 cents and lasts for
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