Answer:
7
Explanation:
25$ Basic fee per month.
25 + 1 = 26 = 1 Class
26 + 1 = 27 = 2 Classes
27 + 1 = 28 = 3 Classes
28 + 1 = 29 = 4 Classes
29 + 1 = 30 = 5 Classes
30 + 1 = 31 = 6 Classes
31 + 1 = 32 = 7 Classes
or
32 - 25 = 7
So Bill took 7 classes
7.5m questions
10.0m answers