>>> from expenses import expenses

>>> ld= [[2.0, 3.0, 4.0, 5], [6.0, 7.0, 6.0, 8], [50.0, 10.0, 4.0, 5]]
>>> total = expenses(ld, 0.11)
>>> lres = [[2.0, 3.0, 4.0, 5, 1.54], [6.0, 7.0, 6.0, 8, 2.97], [50.0, 10.0, 4.0, 5, 7.59]]
>>> total == 12.1 and lres == ld
True