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Mathematics

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A day-care center's thermostat used to be set at 70 degrees for 24 hours a day. To save money, the owner decides to turn down the furnace for 9 hours during the night between the hours 8 P.M. and 5 A.M. If she saves $2.70 per day on her heating bill, how much will she save during a 30-day month?

Answer :

Today at 8:40 PM

$2.70 dollars saved per day multiplied by 30 days is a total of 2.7*30=$81.

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