Please do not put incorrect answer if you do not know how to solve. thank you so much

Table 1 Figure 1. AON network diagram 1. Using the information given, Calculate the completion time of the project. Identify the activities on the critical path. 2. Using the information given and the project completion time calculated in Problem 1, reduce the completion time of the project 3 weeks in the most economical way. 3. Using the information given and the project completion time calculated in Problem 1, calculate the minimum time for completing the project possible