29 Min D Question 36 3.5 pts Marginal private Quantity Marginal private Marginal social cost and (millions of benefit benefit marginal social (thousands of students per (thousands of cost (thousands dollars per year) dollars per of dollars per student per year) student per year) student per year) 4 20 28 8 8 18 25 10 12 16 22 12 16 14 19 14 20 12 16 16 24 10 13 18 The table above shows the marginal costs and marginal benefits of college education. The marginal external benefit of college education at the efficient amount of enrollment is $ per vear