>>> from flatrate import update

>>> lclients = [['444B', 200, 70, 40, 120], ['333A', 200, 35, 50], 
... ['555C', 100, 30, 23, 30, 60]]
>>> update (lclients, 2.4)
>>> lclients
[['444B', 200, 70, 40, 120, 72.0], ['333A', 200, 35, 50], ['555C', 100, 30, 23, 30, 60, 103.2]]