Can someone in Excel please please show me how to answer this question (like showing the Excel sheet and equations, I'm too broke for Microsoft Project), to find the critical path and how long the project will take. (The problem is below). I just wanna make a comprehensive excel sheet that I can just plug the activity, immediate predecessors, and time(days) so it'll calculate it for me.

In the following table the activities with their precedence sequence and expected time (days) are listed for a project: a) The activities on the critical path are A-C - F - G - I b) The project length is days