Consider the 7 activities of a project, whose precedences, execution time and costs appear in the following table:

Activity	Preceded by	Normal time (days)	Normal Cost ($ per day)	Accelerated time (days)	Accelerated cost ($ per day)
A	-	10	2000	8	2400
B	-	12	1500	10	1800
C	-	13	700	11	850
D	A,B	14	5600	13	5650
E	B	13	1600	10	2200
F	D,E	5	2500	4	2600
G	B,C	10	1000	8	1050

a) Determine the critical path(s) and the execution time of the project. b) Calculate the cost slopes of each project activity. c) How much will it cost to advance the execution time of the work by 3 days? d) Make the graph TIME - COST.