How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 1/11100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Saints 18 Castres 12 -36.4
-36.4
-3.7
Ulster 23 Glasgow 6 -0.2
-0.2
-0.0
ASM Clermont 46 Chiefs 3 +0.0
Week of 1/18100.0*Chance in playoffs100.0*Promoted100.0*Average seed
Castres 8 Ulster 9 Out
No
Games Above .500
Chance Will Make Playoffs