February 26, 2017

Homework Help: Math

Posted by Jen on Tuesday, February 2, 2010 at 11:33am.

You can buy an energy-saving light bulb for $18.07, which can work for 10,000 hours. It costs you 0.8 cents to operate it for an hour. ($1=100 cents). A regular light bulb with the same intensity costs 39 cents. The light bulb can work for 1000 hours. It costs you 3.4 cents to operate it for an hour. After how many hours of operation is the energy-saving light bulb more economical?

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