Problem 17-13 Here is a list of activity times for a project as well as crashing costs for its activities.

Problem 17-13

Here is a list of activity times for a project as well as crashing costs for its activities. Determine which activities should be crashed and the total cost of crashing if the goal is to shorten the project by three weeks as cheaply as possible. (Omit the "$" sign in your response.)

ActivityDuration (weeks)First CrashSecond Crash1-25$8            $10            2-467            9            4-7314            15            1-339            11            3-478            9            1-5510            15            5-6511            13            6-7512            14            

     Activity   Cost  First crash(Click to select)1-31-21-5

 $           Second crash(Click to select) 2-4 and 3-4, 2-4 and 5-6, 3-4 and 5-6

 $           Third crash(Click to select)4-7 and 6-7, 5-6 and 6-7, 4-7 and 3-4

 $