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【单选题】
Consider a refrigeratior that consumers 320 W of electric power when it is running. If the refrigerator runs only one quearter of the time and the unit cost of electricity is $0.09/kWh. The electricity cost of this refrigerator per month (30 days) isA.
$3.56
B.
$5.18
C.
$8.54
D.
$20.74
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