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*Promoted
Leinster 33 Scarlets 14 -0.0
Week of 1/18100.0*Chance in playoffs100.0*Promoted
Scarlets 0 ASM Clermont 29 No
Games Above .500
Chance Will Make Playoffs