Oscar charges $25 for the first hour of tutoring and $15 for each additional hour or fraction of an hour, counting as a whole hour. The rates that Latoya charges for x hours of tutoring are modeled with the function shown:

30x & ,0leq xleq 3
20x & ,310x & ,x>6

Given this information, complete the following sentence to make it true: Oscar will charge $ more to tutor for 5.5 hours.
a) $10
b) $20
c) $30
d) $40