protected function getDiscountForClientGroup(ClientGroupInterface $clientGroup = null) : float
    {
        if (null !== $clientGroup) {
            return round((float)$clientGroup->getDiscount() / 100, 2);
        }
        
        return 0;
    }
protected function getDiscountForClientGroup(ClientGroupInterface $clientGroup = null) : float
    {
        if (null !== $clientGroup) {
            return round((float)$clientGroup->getDiscount() / 100, 2);
        }
        
        return 0;
    }
protected function getDiscountForClientGroup ( ClientGroupInterface $ clientGroup = null ) : float { if ( null !== $ clientGroup ) { return round ( ( float ) $ clientGroup -> getDiscount ( ) / 100 , 2 ) ; } return 0 ; }
Returns the discount for client's group

@param ClientGroupInterface $clientGroup

@return float
Returns the discount for client s group