Solve in excel and show formulas. thanks :)

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The precedence diagram relevant to a project is given below. Formulate a network model to solve the following questions: a) Draw the network (AOA) diagram of the project according to the precedence requirements. b) Model the project as an optimization problem to determine the normal project completion times and critical path. c) Given the crashing cost/day associated with the activities, what is the total additional cost required to complete the project in 28 days? d) If crashing costs are not considered, what is the shortest amount of time can be finished? _L Activtities Precedence requirements Normal activity times Allowable crashing times Crashing cost/day 2 2 2 3 S 190.00 220.00 310.00