Consider a model for the long-term dining behavior of the students at College USA. It is found that 25% of the students who eat at the college's Grease Dining Hall return to eat there again, whereas those who eat at Sweet Dining Hall have a 93% return rate. These are the only two dining halls available on campus and assume that all students eat at one of these halls. Formulate a model to solve for the long-term percentage of students eating at each hall.