please answer A B and C

a spreadsheet.) \begin{tabular}{cccccc} Project & Year 0 & Year 1 & Year 2 & Year 3 & Year 4 \\ \hline A & $50 & $25 & $20 & $20 & $15 \\ B & $100 & $20 & $40 & $50 & $60 \\ \hline \end{tabular} a. What are the IRRs of the two projects? b. If your discount rate is 5.0%, what are the NPVs of the two projects? c. Why do IRR and NPV rank the two projects differently