Suppose you must remove an average of 3.4 × 108 J of thermal energy per day to keep your house cool during the summer.

(a) If you upgrade from an old air conditioner with a COP of 2.0 to a new air conditioner with a COP of 6.0, by how many joules is the required mechanical work reduced each day?

(b) If the cost of supplying your air conditioner with mechanical work is $0.12 per 3.6 × 106 J, how much money will you save during a 92-day cooling season?