Calculate Minimum Total Direct Cost For Project Durations 532404

A project has numerous activities. These activities are given in the table below, together with time estimates (in weeks) and 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. Determine the critical paths when normal activities are utilized?

B. Calculate minimum total direct cost for each of the given project durations (based on cost related with each activity): 13, 14, 15, 16, 17, and 18 weeks.