Please help no tutor has been able to solve this. The sig figs are 2 and please do not solve if you aren't sure of your answer I will downvote if it is wrong! This is my last attempt!

In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 12.1 C'C. The temperature at the inside surface of the wall is 21.4 0C. The wall is 0.12 m thick and has an area of 8.7 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? Number Units hrs V