How are these numbers calculated?

Big Games

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

Week of 4/4100.0*Chance in playoffs100.0*Average seed
Atletico Nacional 1 Palmeiras 2 +28.5
+0.7
Cerro Porteno 1 Rosario Central 3 In
+0.2
Week of 4/11100.0*Chance in playoffs100.0*Average seed
Rosario Central 1 Atletico Nacional 2 -0.4
Palmeiras 2 Cerro Porteno 3 -0.1
Week of 4/19None
Points
Chance Will Make Playoffs