4.(20 points) The independent project estimates below have been developed by the engineering and finance managers. The corporate MARR is 15% per year, and the capital investment limit is $6.0 million. Project 3 and 4 can't be selected at the same time. Use the PW method and Solver to select the economically best projects. Project 1 Life, Years 1 2 Project Cost, S Millions -2.0 -3.0 -1.7 -1.5 NCF, S/year 540,000 600,000 520,000 700,000 3 1 4