Answer:
The high school student should analyze the point at which the marginal cost equals the marginal benefit.
In other words, he or she should see if the increased costs of attending Petesburg University are more or less equal to the increased benefit that is gained from graduating from a more prestigious university.
The student should also analyze the possible opportunity cost in the future. Attending amore renowned college can result in better job prospects than doing otherwise. Higher salaries in the future could be given up if he or she chooses the cheaper option.