>>> from promocio import calcula_desc

>>> calcula_desc(2.10, 5, 'F', 10, 'VIP')
1.89
>>> calcula_desc(1.05, 3, 'T', 8, 'noVIP')
1.05
>>> calcula_desc(1.05, 2, 'F', 8, 'VIP')
1.0
>>> calcula_desc(1.95, 3, 'F', 5, 'noVIP')
1.85
>>> calcula_desc(1.19, 6, 'T', 10, 'VIP')
1.19
>>> calcula_desc(1.95, 2, 'F', 5, 'noVIP')
1.95