Build a calculator to solve for t and r

Solve for t \begin{tabular}{l|l|l|} \hline AFV & enter values here \\ \hline C & results \\ \hline \# per/year & \\ \hline annual rate \\ \hline rate per period & nper \\ \hline \# of periods & be sure that you enter a "0" for PV in the function \\ \hline \end{tabular} \# of years be sure that you enter a "-" before PMT. In other words, PMT must be negative in the function. Total Invested Interest Years Total Invested C \begin{tabular}{r} 25 \\ 50 \\ 75 \\ \hline 125 \\ 150 \\ 175 \\ 200 \end{tabular} AFV Solve for r enter values here results \# per/year \# of years \# of periods annual rate Total Invested Total Interest Solve for t \begin{tabular}{l|l|l|} \hline AFV & enter values here \\ \hline C & results \\ \hline \# per/year & \\ \hline annual rate \\ \hline rate per period & nper \\ \hline \# of periods & be sure that you enter a "0" for PV in the function \\ \hline \end{tabular} \# of years be sure that you enter a "-" before PMT. In other words, PMT must be negative in the function. Total Invested Interest Years Total Invested C \begin{tabular}{r} 25 \\ 50 \\ 75 \\ \hline 125 \\ 150 \\ 175 \\ 200 \end{tabular} AFV Solve for r enter values here results \# per/year \# of years \# of periods annual rate Total Invested Total Interest