The promoter of a rock concert must perform the tasks shown in table below before the concert can be held (all duration are in days).
Activity Description Immediate Predecessors a b m
A Find site - 2 4 3
B Find engineers A 1 3 2
C Hire opening act A 2 10 6
D Set radio and TV ads C 1 3 2
E Set up ticket agents A 1 5 3
F Prepare electronics B 2 4 3
G Print advertising C 3 7 5
H Set up transportation C 0.5 1.5 1
I Rehearsals F, H 1 2 1.5
J Last-minute details I 1 3 2
a) Draw the project network
b) Determine the critical path
c) If the advance promoter wants to have a 99% chance of completing all preparations by June 30, when should work begin on finding a concert site?