text: def aumentar(v = 0, formato = False):
      val = v * (10/100) + v
      return val if format is False else moeda(val)
  
  
  def diminuir(v = 0, formato = False):
      val = v - v * (10/100)
      return val if format is False else moeda(val)
  
  
  def dobro(v = 0, formato = False):
      val = v * 2
      return val if format is False else moeda(val)
  
  
  def metade(v = 0, formato = False):
      val = v / 2
      return val if format is False else moeda(val)
  
  
  def moeda(m):
      val = (f'R$ {m:5.2f}'.replace('.', ','))
      return val
  