If the normal project cost (before project crashing) is 32 000$ and the overhead cost is 600$ per day, what is the optimal project duration with the least total cost? Justify this answer with a graph of Project duration vs Cost showing three curves: 1) Project cost, 2) Overhead cost, and 3) Total cost = Project cost + Overhead cost.

\begin{tabular}{|c|c|c|} \hline Activity & Maximumreduction(days) & Accelerationcost($/day) \\ \hline A & & \\ \hline B & 6 & 75 \\ \hline C & 5 & 100 \\ \hline D & 4 & 250 \\ \hline E & 3 & 100 \\ \hline F & & \\ \hline G & & \\ \hline H & & \\ \hline I & 2 & 550 \\ \hline J & & \\ \hline K & 2 & 500 \\ \hline L & 4 & 850 \\ \hline M & & \\ \hline \end{tabular}