Needing help with the last question, please. Please do not answer if you don't know.

PM.61 Rob Smith is managing a small project at Boston University. He is under pressure to shorten the overall duration of the project by 4 weeks and he wants to do so at the lowest cost possible. In order to meet this objective a number of activities must be crashed. What is the duration of the project (in weeks)? What is the target duration of the project (after crashing the project)? By how many weeks should activity A be crashed? By how many weeks should activity B be crashed? By how many weeks should activity C be crashed? By how many weeks should activity D be crashed? By how many weeks should activity E be crashed? By how many weeks should activity F be crashed? What is the total cost of crashing the project 4 weeks (just the additional cost, not total project cost)? (Display your answer to two decimal places.)