please solve in excel and show step by step

Q3. (10 points) A HOME LANDSCAPTIVA OPTION IN CAPE BRETON, NOVA SCOTIA When buyers purchase new homes, they usually choose to do their own landscaping on their new property. The PERT/CPM network shown in the figure below represents a landscaping project for a new home in Cape Breton, Nova Scotia. The time is measured in days. 10 @ I a. What are the expected completion time and the critical path for the landscaping project in Cape Breton, N.S.? b. What are the earliest and latest start and finish times for activity C? c. How long can activity A be delayed without delaying the minimum completion time of the project? d. If activities A, C, and F are each delayed three days, how long will the landscaping project be delayed