I'm about halfway done with an excel production sheet on the guides section.. I need some numbers I was wondering if anyone had them. 

Basically I want to know all the factors that affect final effeciency on a production run, and how they work together.  so.. extensions, CT level, and factory level.  are they all direct percentages? do they add or multiply?  I'm hoping someone has the answers already so I dont have to spend EP to figure it out