Banker shine reshe da masu sita aka danganta cikin kuɗi-kuɗi — 'favourite' na 1.25 da aka ɗauka ne kawai don ƙarfafa odds. Ilimin lissafi da yawancin mutane ba sa kuna: farashi na 1.25 yana nuna cewa akwai ƙimar kuskure na 20% ko da a cikin yanayin jiya na mai sita, kuma wannan kuskure yana murzela duk tarhuwa.
Bankers kuma suna ɗauka mafi muni na farashin a bera: masu karɓi masu nauyi suna waje inda kuɗi-kuɗi na mutane ta watarke, don haka farashinsu suna cikin gida fiye da kowane sashe. Ƙara ɗaya a cikin kuɗi-kuɗi yawanci yana ƙara margin, ba tsaro ba.
Four-fold na 6.00 ya zama 7.50 tare da banker na 1.25 da aka ƙara. Banker yana tunkarar jiya sau daya a cikin biyar a cikin nufin jiha ta kanta — ka canja 25% ƙarfafawa na sanda da damlamewa na 20% don juyar da kowane kuɗi-kuɗin da ya nasara ta jiya zuwa wuta.