text: def moeda(funcao, moeda='R$'):
      return f'{moeda}{funcao:.2f}'.replace('.', ',')
  
  
  def aumentar(p, taxa, mostrar=False):
      res = p * (1 + taxa/100)
      return res if mostrar is False else moeda(res)
  
  
  def diminuir(p, taxa, mostrar=False):
      res = p * (1 - taxa/100)
      return res if mostrar is False else moeda(res)
  
  
  def dobro(p, mostrar=False):
      res = p * 2
      return res if mostrar is False else moeda(res)
  
  
  def metade(p, mostrar=False):
      res = p / 2
      return res if mostrar is False else moeda(res)
  