please show excel calculations, answer each highlighted section, and answer the a, b, c at the bottom

6.12 Problems with Profitability Index The Cori's Sausage Corporation is trying to choose between the following two mutually exclusive design projects: a. If the required return is 10 percent and the company applies the profitability index decision rule, which project should the firm accept? b. If the company applies the NPV decision rule, which project should it take? c. Exolain whv vour answers in (a) and (b) are different