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

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. ActivityDuration (weeks)First CrashSecond Crash1 25$8$102 46$7$94 73$14$151 33$9$113 47$8$91 55$10$155 65$11$136 75$12$14