How are these numbers calculated? (show)

Points Behind 1st  (Full Screen)
Chance Will Win Championship  (Full Screen)
RaceFinishStartLapsLeadPointsBonusPenaltyTotalPurse
Orbitz 30034231016161$42,800
Stater Bros. 300131915012412426,025
Telcel-Motorola Mexico 200
Sam’s Town 300162419811511524,520
Nicorette 300
Sharpie Mini 300
Pepsi 300
O'Reilly 300
Bashas' Supermarkets 200
Aaron’s 312
Circuit City 250
Diamond Hill Plywood 200
Carquest Auto Parts 300
Dover 200
Federated Auto Parts 300
Meijer 300
AT&T 250
Camping World 200
Winn-Dixie 250
USG Durock 300
Gateway 250
Kroger 200
NAPA Auto Parts 200
Zippo 200 at The Glen
Carfax 250
Food City 250
Camping World 300
Emerson Radio 250
RoadLoans.com 200
Yellow Transportation 300
Dollar General 300
Sam’s Town 250
O'Reilly Challenge
Arizona.Travel 200
Ford 300
4490300+0-0=300$93,345