>>> from discount3 import discount3

>>> round(discount3(90, 10), 2)
99.0
>>> round(discount3(93, 10), 2)
97.3
>>> round(discount3(80, 25), 2)
100.0
>>> round(discount3(115, 21), 2)
134.15
>>> round(discount3(120, 25), 2)
145.0
>>> round(discount3(223, 16), 2)
238.68