Question $4.(20$ Points$)$ Consider the following network diagram $($activity times are in weeks$)$:

a$)$ Find the critical path and the completion time in weeks for the project. Show all your work.

b$)$ Using the following table, reduce the project completion time by four weeks. Show, step by step, how you

arrived at your schedule.

c$)$ What was the total cost of the project before reducing the project completion time? What is the total cost

of the project after this time reduction?