Which tasks should be crashed and by how much what is the


A project involves the following activities:

            Activity           Predecessor     Normal           (Min.) Crash                   Cost of

                                                            Duration              Duration                  Crashing/day

                 A                       -                4 days                   3 days                       $100

                 B                       -                7    “                     4    “                         $300

                 C                       A              2    “                     1    “                         $400

                 D                     B, C            5    “                     4    “                         $200

            Suppose the benefit arising from reducing the project duration is $500/day. Which tasks should be crashed, and by how much? What is the total net benefit.

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