Solve A,and b briefly

A-:

Activity	Pred.	NT(months)	CT(months)	NC $	CC $
A	-	6	4	2,000	2,400
B	-	7	5	3,000	3,500
C	A	7	6	1,000	1,300
D	B	6	4	2,000	2,600
E	D	9	8	8,800	9,000

1. Draw the project network
2. Determine the ES,EF,LS,LF,Slack for each activity.
3. Crash the Project by 3 months.

B-:

Activity	Pred.	NT(weeks)	CT(weeks)	NC $	CC $
A	-	4	3	2,000	2,600
B	-	2	1	2,200	2,800
C	-	3	3	500	500
D	A	8	4	2,300	2,600
E	B	6	3	900	1,200
F	C	3	2	3,000	4,200
G	D,E	4	2	1,400	2,000

1. What is the completion time of the project?
2. What is the total cost required to complete this project on normal time?
3. If you wish to reduce the completion time of the project by 1 week, which activity should be crashed and how much will this increase total cost?
4. By 3 weeks? By 5 week?