how did we get here the DCF and CDCF

\begin{tabular}{|rrrrr|} \hline YEAR & PROJECT A & CCF & DCF & CDCF \\ \hline 0 & -1000 & -1000 & -1000 & -1000 \\ 1 & 600 & -400 & 545.4545455 & -454.5454545 \\ 2 & 300 & -100 & 247.9338843 & -206.6115702 \\ 3 & 200 & 100 & 150.2629602 & -56.34861007 \\ 4 & 100 & 200 & 68.30134554 & 11.95273547 \\ 5 & 500 & 700 & 310.4606615 & 322.413397 \\ \hline YEAR & PROJECT B & CCF & DCF & CDCF \\ \hline 0 & -10000 & -10000 & -10000 & -10000 \\ 1 & 5000 & -5000 & 4545.454545 & -5454.545455 \\ 2 & 3000 & -2000 & 2479.338843 & -2975.206612 \\ 3 & 3000 & 1000 & 2253.944403 & -721.2622089 \\ 4 & 3000 & 4000 & 2049.040366 & 1327.778157 \\ 5 & 3000 & 7000 & 1862.763969 & 3190.542126 \\ \hline YEAR & PROJECT C & CCF & DCF & CDCF \\ 0 & -5000 & -5000 & -5000 & -5000 \\ 1 & 1000 & -4000 & 909.0909091 & -4090.909091 \\ 2 & 1000 & -3000 & 826.446281 & -3264.46281 \\ 3 & 2000 & -1000 & 1502.629602 & -1761.833208 \\ \hline 4 & 2000 & 1000 & 1366.026911 & -395.8062974 \\ \hline 5 & 2000 & 3000 & 1241.842646 & 846.0363487 \\ \hline \end{tabular}