>>> from promocio import aplica_promocio

>>> lcomp1 = ['macarrons,2.12,5,F', 'arròs,1.05,1,F', 'cigrons,1.05,3,F', 'iogurt natural,1.95,3,F', 'llet sencera,1.19,6,T']
>>> aplica_promocio(lcomp1,15,'noVIP')
>>> lcomp1
['macarrons,1.8', 'arròs,1.05', 'cigrons,1.0', 'iogurt natural,1.66', 'llet sencera,1.19']

>>> lcomp2 = ['galetes,1.20,2,F', 'farina,1.35,5,F', 'oli oliva,6.50,1,F', 'medicació,3.00,2,T']
>>> aplica_promocio(lcomp2,3,'noVIP')
>>> lcomp2
['galetes,1.2', 'farina,1.31', 'oli oliva,6.5', 'medicació,3.0']

>>> lcomp3 = ['macarrons,2.12,5,F', 'arròs,1.05,1,F', 'cigrons,1.05,3,F', 'iogurt natural,1.95,3,F', 'llet sencera,1.19,6,T']
>>> aplica_promocio(lcomp3,15,'VIP')
>>> lcomp3
['macarrons,1.8', 'arròs,1.0', 'cigrons,1.0', 'iogurt natural,1.66', 'llet sencera,1.19']

>>> lcomp4 = ['galetes,1.20,2,F', 'farina,1.35,5,F', 'oli oliva,6.50,1,F', 'medicació,3.00,2,T']
>>> aplica_promocio(lcomp4,3,'VIP')
>>> lcomp4
['galetes,1.16', 'farina,1.31', 'oli oliva,6.3', 'medicació,3.0']