Excel Formula help please

May I have help checking the IRR and the formulas I would use for the rest please

a. Calculate the IRR for each of the projects. IRR b. If the discount rate for all three projects is 10 percent, which project or pr undertake? c. What is the NPV of each of the projects where the appropriate discount percent? Discount rate \begin{tabular}{|l|l|l} \hline Project A & \multicolumn{1}{c}{ Project B } & Project C \\ \hline & & \\ \hline \end{tabular}