Your Company fabricates concrete forms that include additional insulating material which saves ½ of cooling and heating expenses (the forms remain in place). However, using these new concrete forms adds 10% to the overall cost of the home. A typical 2,000 sq. ft. home using standard concrete forms costs $120 per square foot to construct and uses $300 per month average to heat and cool. Calculate the IRR on a home using your company's insulated concrete forms on a typical 2,000 sq. ft. home. The residual value in any case (with either concrete form system) in 20 years will be the same with or without the insulating materia