It Costs $75 Per Day for Each Day That a Construction

It costs $75 per day for each day that a construction crew is on site.The project manager determines that most activities can be crashed and has listed the crashing costs next to the minimum time for each activity.Use this information to determine the lowest cost for this project.All times given are in days. $$\begin{array} { | l | l | l | l | l | } \hline & \text { Normal } & \text { Minimum } & \text { Crash Cost } & \\ \text { Activity } & \text { Time } & \text { Time } & \text { (\$/day) } & \text { Predecessor } \\\hline \text { A } & 10 & 6 & \$ 70 & - \\\hline \text { B } & 6 & 3 & \$ 40 & - \\\hline \text { C } & 2 & 2 & - & \text { B } \\\hline \text { D } & 4 & 2 & \$ 60 & \text { C } \\\hline \text { E } & 6 & 4 & \$ 80 & \text { A } \\\hline \text { F } & 8 & 5 & \$ 90 & \text { D, E } \\\hline\end{array}$$

A) $1,720
B) $1,750
C) $1,780
D) $1,810