Focus on the difference between feasible alternatives ​(Principle 2LOADING...​)! Insulated concrete forms​ (ICF) can be used as a substitute for conventional wood framing in building construction. Heating and cooling bills will be about ​% less than in a similar​ wood-framed building in upstate New York. An ICF home will be approximately ​% more expensive to construct than a​ wood-framed home. For a typical ft home costing ​$ ft to construct in upstate New York and costing ​$ per month to heat and​ cool, how many months does it take for a ft ICF home to pay back its extra construction​ cost?