Revenue function help?

If exactly 208 people sign up for a charter flight, Leisure World Travel Agency charges $310/person. However, if more than 208 people sign up for the flight (assume this is the case), then each fare is reduced by $1 for each additional person. Hint: Let x denote the number of passengers above 208

1. whats the revenue function

2. how many passengers will result in a maximum revenue

3. what is the maximum revenue

4. what will be the fare per passenger in this case