Activity Normal Preceding Slope Maximum Normal Time Activity Crash Time Cost 1 5 None 40 1 150 2 8 None 60 3 100 3 7 1 20 2 200 4 9 1 10 1 120 5 6 2 40 3 140 6 3 3, 4, 5 20 2 130 7 2 3, 4, 5 40 1 100 8 1 6, 7 0 0 200 9 2 6 10 1 300 10 1 7, 8, 9 0 0 150 11 3 7 80 1 100 12 1 10, 11 0 0 200 Use the information provided to crash one-time unit per move using the least cost method. Indirect costs are $200 at the start of the project and are reduced by $23 for each time unit saved. Reduce the schedule until you reach the crash point of the network. Compute the total project cost for each duration. What is the optimal crash cost? (enter your answer as a whole number, numerical values only)