Mаrginаl privаte benefit (dоllars) Quantity (thоusands оf student-years) 24,000 0 20,000 20 16,000 40 12,000 60 8,000 80 4,000 100 0 120 The table above provides information about the marginal private benefit for education. The marginal cost of educating a student is $16,000 per year and is constant. There is an external benefit from education that is equal to $12,000 per student year and is constant. If the government subsidizes education, how much should the subsidy be in order to attain the efficient level of enrollment?