Help me with this

9.8-5. The Lockhead Aircraft Co. is ready to begin a project to develop a new fighter airplane for the U.S. Air Force. The com- pany's contract with the Department of Ikfense calls for proj- ect completion within 92 weeks, with penalties imposed for late delivery. The project involves 10 activities (labeled A. B. where their precedence relationships are shown in the project net- work below. START HNISH 1 Management would like to avoid the hefty penalties for missing the deadline in the current contrxt. TIErefore. the decision has been made to crash the project. using the CPM method of tirne- cost trade-offs to determine how to do this in the most economi- cal way. The data needed to apply this method are given next. Activity c D E c H Normal Time 32 weeks 28 weeks 36 weeks 16 weeks 32 weeks 54 weeks 17 weeks 20 weeks 34 weeks 18 weeks Crash 28 weeks 25 weeks 31 weeks 13 weeks 27 weeks 47 weeks 15 weeks 17 weeks 30 weeks 16 weeks S 160 million S 125 million s 170 million S 60 milbon S 1 35 milion $215 million S 90 million S 120 million S 190 million S 80 milbon Crash S 180 million S 146 million sno milbon S 72 miNion S 160 'Wllion S257 million S 96 miUion Sl 32 million S226 million S 84 milion (a) Formulate a lirkar programming model for this ryoblerm c (b) Use Excel to solve the problem. c (c) Use another software option to solve the problem.