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hours would be .8 kilowatt-hours x $.08 = $.064. B. Determine the cost of operating a refrigerator rated at 500 watts for one week, assuming. that it is actually cooling only 4 hours per day. To solve, take the watts (500) times the. number of hours per day (4) times the number of days in a week (7) รท 1000 (the number. of watts in a kilowatt). ................
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