How are these numbers calculated? (show)

Points Behind 1st  (Full Screen)
Chance Will Win Championship  (Full Screen)
RaceFinishStartLapsLeadPointsBonusTotalPurse
Vegas Grand Prix22682727$50,000
Toyota Grand Prix Of Long Beach1315748818,000
Grand Prix of Houston37932512640,000
Grand Prix of Portland321032512640,000
Grand Prix of Cleveland2589272750,000
Champ Car Mont-Tremblant126220313175,000
Steelback Grand Prix of Toronto6972191927,500
Rexall Grand Prix Edmonton111195101019,000
San Jose Grand Prix115107303113275,000
Generac Grand Prix143497717,000
Grand Prix of Zolder7371171725,000
Grand Prix of Assen139698818,000
Lexmark Indy 300414612312435,000
Gran Premio de Mexico1631251616,000
First Data Grand Prix Arizona
1,02550263+5=268$505,500