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A refrigerator in a house uses 0.4 kilowatt for 6.8 hour. If electricity costs $0.21 per kilowatt-hour, how much does it cost (in dollars, to

A refrigerator in a house uses 0.4 kilowatt for 6.8 hour. If electricity costs $0.21 per kilowatt-hour, how much does it cost (in dollars, to the penny) to use the refrigerator? Use exact numbers; do not estimate.

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