Please show the excel formulas in solving the problem. Thank you.

4) There are three projects, where the basic information is provided below. a) If the alternatives are independent, which projects should be selected if the company's MARR is 14.5% per year? b) If the alternatives are mutually exclusive, would your results change? Why? 5). There are three mutually exclusive project, where the basic information is provided below. Assume a DN alternative does not exist. a) Using the incremental cost analysis, calculate the incremental rate of return for each switch? b) Assuming MARR Is 11% per year, what would be your final decision? c) If the DN exist, do your decision change? Why