On the first day of college, the Dean addressed the students, 
pointing out some of the rules:

"The female dormitory will be out-of-bounds for all male 
students, and the male dormitory to the female students. 
Anybody caught breaking this rule will be fined $20 the first time."

He continued, "Anybody caught breaking this rule the second 
time will be fined $60. Being caught a third time will cost 
you a fine of $180. Are there any questions?"
                                                    
At this point, a male student in the crowd inquired:
"How much for a season pass?"