The managing partner of the Scott Corey accounting firm (see Problem 11-34) has decided that the system must be up and running in 16 weeks. Consequently, information about crashing the project was put together and is shown in the following table:

(a) If the project is to be finished in 16 weeks, which activity or activities should be crashed to do this at the least additional cost? What is the total cost of this?

(b) List all the paths in this network. After the crashing in part

(a) has been done, what is the time required for each path? If the project completion time must be reduced another week so that the total time is 15 weeks, which activity or activities should be crashed? Solve this by inspection. Note that it is sometimes better to crash an activity that is not the least cost for crashing if it is on several paths rather than to crash several activities on separate paths when there is more than one critical path.

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ACTIVITY IMMEDIATE NORMAL CRASH NORMAL TIME PREDECESSORS (WEEKS) (WEEKS) ($) TIME COST CRASH COST ($) A 3 2 8,000 9,800 A B BCD 4 3 9,000 10,000 6 4 12,000 15,000 B 2 1 15,000 15,500 E A 5 3 5,000 8,700 F C 2 1 7,500 9,000 G D, E 4 2 8,000 9,400 H F, G 5 3 5,000 6,600