In analyzing a project, the opportunity cost rate has been found to be equal to 12%. The estimated revenues and expenditures are given in the table. Find the net cash flow to calculate the Net Present Value and the B/C ratio. Decide whether to invest or not by analyzing these two indicators.

\begin{tabular}{|l|c|c|c|c|c|c|} \hline PROYECTO A" & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline INGRESOS & & 20000 & 22000 & 25000 & 25000 & 25000 \\ \hline EGRESOS & 50000 & 2000 & 2500 & 3000 & 3000 & 3000 \\ \hline PROYECTO "B" & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline INGRESOS & & 15000 & 16000 & 18000 & 18000 & 18000 \\ \hline EGRESOS & 50000 & 3000 & 3200 & 3500 & 3500 & 3500 \\ \hline PROYECTO "C" & 0 & 1 & 2 & 3 & 4 & 5 \\ \hline INGRESOS & & 17000 & 17000 & 17000 & 17000 & 17000 \\ \hline EGRESOS & 50000 & 2500 & 2500 & 2500 & 2500 & 2500 \\ \hline \end{tabular}