def define_percentual_desconto(self):
        # Define um percentual de desconto, com 70% de probabilidade de retornar 0% de desconto.
        return np.choice([0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50], p=[0.7, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03, 0.03])