Here are the precedence requirements, normal and crash activity times, and normal and crash costs for a construction project:

a. What are the critical path and the estimated completion time?

b. To shorten the project by three weeks, which tasks would be shortened and what would the final total project cost be?

Please answer via EXCEL

\begin{tabular}{|c|c|c|c|c|c|c|c|} \hline & Path & Activity's time & Total time (Week) & n=0 & n=1 & n=2 & n=3 \\ \hline \multirow[t]{9}{*}{com} & ABDHI & 22 & & & & & \\ \hline & ABEHI & 18 & & & & & \\ \hline & ABEG & 18 & & & & & \\ \hline & ACEC: & 17 & & & & & \\ \hline & ACFGI & 19 & & & & & \\ \hline & & & & & & & \\ \hline & & & & Elipbie\& Min Crashing Cost & & & \\ \hline & & & & Daily Crashing Cost & & & \\ \hline & & & & Toeal Crashing Cost & & & \\ \hline \end{tabular}