>>> from expenses import expenses

>>> le1 = [500, 250, 1000]
>>> expenses(le1)
>>> le1[:-1]
[500, 750, 1750]
>>> round(le1[-1], 1)
583.3

>>> le2 = [441, 244, 1023, 156, 1078, 367]
>>> expenses(le2)
>>> le2[:-1]
[441, 685, 1708, 1864, 2942, 3309]
>>> round(le2[-1], 1)
551.5

>>> le3 = [278, 695, 1245, 340, 870, 452, 298, 724, 328, 1457]
>>> expenses(le3)
>>> le3[:-1]
[278, 973, 2218, 2558, 3428, 3880, 4178, 4902, 5230, 6687]
>>> round(le3[-1], 1)
668.7