Project Scheduling. A construction contractor is responsible for a project with seven key tasks. Some of the tasks can EXERCISES 273 Chapter09 09/10/2016 16:19:17 Page 274 begin at any time, but others have predecessor tasks that must be completed previously. The individual tasks can be carried out at standard times or they can be expedited ("crashed"). The cost of executing the task increases by a certain cost per day if its time is shortened. The following table shows the information describing the tasks of the project, their standard and minimum times (in days), their standard costs, the crashing cost per day shortened, and the predecessor(s):

Cost/ Task Minimum Standard Standard Day to Predecessor Number Time Time Cost Shorten Tasks 12 1,600 100 None 16 2,400 75 None 16 24 2,900 120 2 NOGAN NO 14 20 1,900 100 14 16 3,800 140 12 16 2,900 165 2 12 1,300 60 A