i need help calculating the discount rate, the salvage value, and the principal returned

\begin{tabular}{|l|c|} \hline Initial Investment & $12,989 \\ \hline Annual Cash Inflows & $56,153 \\ \hline Discount Rate & \\ \hline Number of Years & 20 \\ \hline Salvage Value & \\ \hline \end{tabular} NPV=$1,136,049 \begin{tabular}{|l|c|} \hline Initial Investment & $12,371 \\ \hline Annual Cash Inflows & $22,194 \\ \hline Discount Rate & \\ \hline Number of Years & 20 \\ \hline Salvage Value & \\ \hline \end{tabular} NPV=436,251 \begin{tabular}{|l|r|} \hline Initial Investment & $27 \\ \hline Annual Cash Inflows & \\ \hline Discount Rate & $0 \\ \hline Number of Years & 10 \\ \hline Principal Returned & \\ \hline \end{tabular} NPV=27 \begin{tabular}{|l|c|} \hline Initial Investment & $12,989 \\ \hline Annual Cash Inflows & $56,153 \\ \hline Discount Rate & \\ \hline Number of Years & 20 \\ \hline Salvage Value & \\ \hline \end{tabular} NPV=$1,136,049 \begin{tabular}{|l|c|} \hline Initial Investment & $12,371 \\ \hline Annual Cash Inflows & $22,194 \\ \hline Discount Rate & \\ \hline Number of Years & 20 \\ \hline Salvage Value & \\ \hline \end{tabular} NPV=436,251 \begin{tabular}{|l|r|} \hline Initial Investment & $27 \\ \hline Annual Cash Inflows & \\ \hline Discount Rate & $0 \\ \hline Number of Years & 10 \\ \hline Principal Returned & \\ \hline \end{tabular} NPV=27