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9 March, 10:38

If a kilowatt-hour of energy costs 75 cents, how much does it cost to leave a 40-watt light bulb on for the entire month of May

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  1. 9 March, 10:55
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    May has 31 days

    31 x 24 = 744 hours in may

    744 x 40 = 29760 watt hours

    29760 watt hours = 29.76 kwh

    29.76 x 75 = 2232 cents

    2232 cents = $22.32
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