please explain also the calculations part please

The COLOURFUL Textile Atelier was controlled by INSPECT and found to be in violation of several safety regulations. The INSPECT controllers ordered the atelier to make several remediation. INSPECT gave the atelier only 245 days to make the changes; if the changes were not made by then, the atelier would be fined $300,000. The atelier determined the activities in a CPM/PERT network that would have to be completed and then estimated the indicated activity times, as shown in the following table. You are required to prepare a report and this report needs to address the concerns of the following: (a) Introduction (b) Literature (c) An explanation of the model and the methodology used (i.e. CPM and PERT). (a) Display your estimated outputs using tables and graphs as well as network diagram. (e) A discussion of the results estimated. (1) Any other comments you feel relevant to the issues being addressed (g) Conclusion and recommendations. Table1: Managing necessary changes in the atelier Time Estimates Predecessor (weeks) 0-m-p Order new machinery Activity Activity Activity Description a 1-2-3 Plan new physical layout b 2-5-8 1-3-5 Determine safety changes in existing machinery Receive equipment d A 4-10-25 Hire new employees e A 3-7-12 Make plant alterations f B 10-15-25 9 5-9-14 Make changes in existing machinery Train new employees Install new machinery h d.e 2-3-7 i d,e.f 1-4-6 Relocate old machinery j d.e.f.g 2-5-10 k Conduct employee safety orientation hij 2-2-2 FINISH HINT