A project has several activities. These activities are shown in the table below, together with their time estimates (in weeks) and the crashing costs information:
Activity Normal Time Normal Cost Crash Time Crash Cost Immediate Predecessors
A 2 $50 1 $70 ---
B 4 $80 2 $160 A
C 8 $70 4 $110 A
D 6 $60 5 $80 A
E 7 $100 6 $130 B
F 4 $40 3 $100 D
G 5 $100 4 $150 C, E, F
A. What is the critical path when normal activities are used?
B. Evaluate the minimum total direct cost for each of the following project durations (based on the cost associated with each activity): 13, 14, 15, 16, 17, and 18 weeks.