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3 December, 12:23

Electricity from the local power company costs 7.22 cents/kWh. A homeowner wishes to pay a maximum of 25 cents per month for the electricity to power a stereo system. For how many hours per month could the stereo system be used?

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  1. 3 December, 12:47
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    You haven't said how much power the stereo uses. It matters!

    Whatever that number is, the maximum hours per month is

    (3460) divided by (the # of watts the stereo uses when it's playing).
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