public function GetInfo()
 {
     return "Nom :" . Parent::GetNom() . " Montant :" . Parent::GetMontant() . " Taux :" . $this->_Taux . " Durée :" . $this->_Duree;
 }
 public function GetInfo()
 {
     return "Nom :" . Parent::GetNom() . " Montant :" . Parent::GetMontant() . " Bourse :" . $this->_Bourse;
 }