>>> from finances import prestec

>>> round(prestec(10000,6,5),2)
2373.96
>>> round(prestec(20500,3,10),1)
2403.2
>>> round(prestec(5150,4,1),2)
5356.0

>>> round(prestec(120000,2.5,30),3)
5733.317
>>> round(prestec(120000,2.5,20),4)
7697.6554
>>> round(prestec(120000,4.5,20),2)
9225.14
>>> round(prestec(120000,5.5,10),1)
15920.1