Please Show Your Work

A Company is considering two mutually exclusive projects whose expected net cash flows are in the table below. The company's WACC is 15%. a. What is the NPV for Project Y ? b. What is the NPV for Project Z? c. What is the IRR for Project Y ? d. What is the IRR for Project Z? e. Which Project, if any, should you choose? \begin{tabular}{|l|l|l|} \hline Time & ProjectY & Project Z \\ \hline 0 & $(420.00) & $(950.00) \\ \hline 1 & $(572.00) & $270.00 \\ \hline 2 & $(189.00) & $270.00 \\ \hline 3 & $(130.00) & $270.00 \\ \hline 4 & $1,300.00 & $270.00 \\ \hline 5 & $720.00 & $270.00 \\ \hline 6 & $980.00 & $270.00 \\ \hline 7 & $(225.00) & $270.00 \\ \hline \end{tabular}