The inside temperature of a house is 65 °F. When the temperature outside the house is 35 °F, the furnace supplies 100 joules per hour to keep the inside of the house warm. If the temperature outside the house increases to 50 °F, then what is the fuel consumption of the furnace? Assume the house loses heat through conduction only.

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38 joules per hour

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42 joules per hour

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50 joules per hour

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56 joules per hour

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61 joules per hour