Perform an economic cost-benefit analysis of whether or not capital should be invested in the "closed cycle" system. Clearly state your decision and conclusion from your analysis. Prepare net present value (NPV) analysis and a payback period analysis as part of your economic analysis. (The NPV and payback period analyses can be organized neatly in an appendix to your case analysis. A reader of your case should be able to follow your work and computations. You can use an Excel spreadsheet. The results of your appendix analyses can be referenced in the body of your case to support your decision.)