How are these numbers calculated? (show)

Points Behind 1st  (Full Screen)
Chance Will Win Championship  (Full Screen)
RaceFinishStartLapsLeadPointsBonusTotalPurse
Ethanol IndyCar 300 at Miami15191191515$37,900
St. Petersburg Indy
Firestone IndyCar 300 at Japan
Kansas IndyCar 300211924121231,900
Indianapolis 50028301481010216,305
Milwaukee A.J. Foyt IndyCar 225
Bombardier Learjet IndyCar 550K at Texas
Ethanol IndyCar 250 at Iowa
Richmond IndyCar Challenge
Watkins Glen IndyCar Grand Prix
Firestone Indy 200 at Nashville
Honda IndyCar 200 at Mid-Ohio
Firestone IndyCar 400 at Michigan
Kentucky IndyCar 300
Sonoma IndyCar Grand Prix
Detroit IndyCar Grand Prix
PEAK Antifreeze IndyCar 300 at Chicago1421190161637,100
481053+0=53$323,205