Activity Description Predecessor Time (weeks) Obtain permission B Obtain materials 5 Foundation AB 2 D Rough Wall 3 E Rool C D 2 F Extenor plumbing E G Interior plumbing DE 2 H Extenor siding DEG 3 1 Exterior painting H 2 J Electrical work F. 2 K Wallboard 2 L Flooring J. K 4 M Interior painting HL 3 N Exterior fixtures HM Interior fixtures MN R&R Limited wishes to know whether the project can be completed over a 30-week period with an additional cost. The following information has been obtained for normal and crash duration of the project Time (weeks) Costin Activity Predecessor Normal Crash Normal Crash 4 2 10.000 10.200 B 5 3 20.000 20,100 , 2 1 60.000 70.000 C 3 1 10.800 12.400 C D 2 1 10,600 11,850 E 4 2 5,200 5,300 DE 2 1 2,000 2.050 DEG 3 10,000 10,050 H 2 1 8.000 11.200 FI 2 1 10.200 12.800 K 2 1 10,400 12.200 JK 2 9,000 10,300 M HL 10.300 11,700 HM 10.800 12,400 MN 10.500 2 12.900