How are these numbers calculated?

Big Games

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

Week of 4/10100.0*Chance in playoffs100.0*Average seed
Libertad 1 America 2 +35.3
+0.5
Week of 4/18100.0*Chance in playoffs100.0*Average seed
America 2 El Nacional 1 In
+0.6
Banfield 0 Libertad 1 +16.7
Week of 4/24None
Points
Chance Will Make Playoffs