>>> from ebill import ebill_check

--ini

>>> ebill_check(10.0, 3.0, 200, 1)
(False, 0)

>>> ebill_check(-7.0, 3.0, 9, 2)
(True, 100)

>>> ebill_check(7.0, -3.0, -10, 2)
(True, 110)

>>> ebill_check(-7.0, -3.0, -10, 8)
(True, 111)

--fi

>>> ebill_check(6.0, 10.0, 300, 7)
(False, 0)

>>> ebill_check(7.0, 3.0, 100, 10)
(True, 1)

>>> ebill_check(7.0, 3.0, 0, 7)
(True, 10)

>>> ebill_check(7.0, 3.0, 0, 17)
(True, 11)