Sam Spade is the Director of Gum Shoe Ltd a Private Eye (Investigator) Firm. He has just hired some UTech graduates and needs to put them through a special training program before sending them out on any job. Sam has listed a number of activities that must be completed before a training program of this nature could be conducted. The activities, immediate predecessors and activity times appear in the following table:

ACTIVITY	IMMEDIATE PREDECESSOR	TIME (DAYS)
A	__	2
B	__	5
C	___	1
D	B	10
E	A, D	3
F	C	6
G	E,F	8

a. Develop a network for this problem

b. Determine the total project completion time and the critical path.