In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 12.8 °C. The temperature at the inside surface of the wall is 20.0 °C. The wall is 0.10 m thick and has an area of 9.0 m2. Assume that one kilowatt ∙ hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall?