Suppose you must remove an average of 3.4 X 10 ^8 J of thermal energy per day to keep your house cool during the summer. If you upgrade from an old air conditioner with a COP of 2 to a new one with a COP of 6, by how many joules is the required mechanical work reduced each day? If the cost of supplying your air condition with mechanical work is $0.12 per 3.6 X 10^6J, how much money will you save during a 92 day cooling season?

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