How many students went on the field trip?How much did each student pay?

The senior class is going on a field trip to the Science Museum, where they will spend the day and see a great 3-D IMAX movie. The museum offers a school group price of $189, and the students will each pay an equal part of that total. When rainy weather caused a baseball game to be rescheduled for the day of the field trip, 12 of the students had to miss the trip to play in the game. As a result, each student who went to the movie paid one dollar more than they would have if the baseball players had gone, too