How are these numbers calculated?

Big Games

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

Week of 3/10100.0*Chance in playoffs
Sao Bernardo 1 Santos 4 +0.0
Week of 3/18100.0*Chance in playoffs
Sao Paulo 1 Ituano 1 In
Week of 3/25None
Chance Will Make Playoffs