5/ a/ You propose to replace windows to save energy. With a discount rate of 6%, what yearly energy savings are required to offset the $25,000 project cost? Consider an investment period of 10 years,...

Extracted text: 5/ a/ You propose to replace windows to save energy. With a discount rate of 6%, what yearly energy savings are required to offset the $25,000 project cost? Consider an investment period of 10 years, and a lifetime of the windows of 30 years b/ Assume that the windows save the amount of energy calculated in 5/a. If the windows would have needed to be replaced anyways at a cost of $20,000 for standard efficiency windows, what is the ROI and Payback for upgrading the windows to the energy efficient model used in Sa/ for the upgrade cost of $5,000?