$Total_a_paye = $this->Calculate_total_HT() * (1 + $this->getTva() / 100);

        var_dump($Total_a_paye);

        $Total_deja_paye = $this->Calculate_deja_paye();

        var_dump($Total_deja_paye);

        $result = $Total_a_paye - $Total_deja_paye;

        var_dump($result);

//      if($result > -0.01 && $result < 0.01)
//          $result = 0;
//
//      var_dump($result);

        exit();

        return ($Total_a_paye - $Total_deja_paye);