I need help on the last question.

Development of Version 2.0 of a particular accounting software product is being considered by Jose Noguera's technology firm in Baton Rouge. The activities necessary for the completion of this project are listed in the following table: Normal Time (weeks) 4 Activity A Crash Time (weeks) 3 Immediate Predecessor(s) 1 3 000 W N Total Cost with Crashing $2,700 $2,900 $500 $2,620 $1,100 $4,200 $1,900 Normal Cost $2,100 $2,300 $500 $2,300 $800 $3,000 $1,400 4 A B 3 N N w 4 D, E a) Based on the given information regarding the activities for the project, the project length = 16 weeks. b) The total cost required for completing this project on normal time = $ 12400 . c) For reducing the duration of the project by one week, the activity that should be crashed first is activity D The cost of the project based on the first activity selected for crashing will increase by $ 80. d) The maximum weeks by which the project can be reduced by crashing = 7 weeks. Total cost of crashing the project to minimum (or maximum weeks possible) = $