An environmentally friendly 2, 400-square-foot green home (99% air tight) costs about 6% more to construct than a same-sized conventional home. Most green homes can save 15% per year on energy expenses to heat and cool the living space. For a $243,000 conventional home with a heating and cooling bill of $2, 500 per year how much would have to be saved in energy expenses per year to justify this home (i.e., B C ratio greater than or equal to one)? The discount rate is 9% per year, and the expected life of the home is 21 years. $ would have to be saved in energy expenses per year to justify this home. (Round to the nearest dollar.)