[CaptainMorgan]

Your code has no main method to test your class. I suggest writing a main method to do so and start from there. At a glance, things seem okay with your code.... so I'm not 100% sure what you're asking exactly.. and the "Note" above is pretty specific so simply do what it says. When you run into a problem, defined as something not functioning correctly due to syntactical or logic related reasons, then I can be better positioned to assist you. Actually.. in retrospect, you already have two arrays, named profit and city, which is what you are supposed to do found in the "Note" section.

Summing it up, 1) start with a tester method(can be a main method), and 2) define your problem specifically(if you run into any).