https://nces.ed.gov/pubs2013/2013183.pdf (for the numbers)

My understanding is that if we redirected all state and federal spending on private and public universities solely to public universities that we could presumably fund them for free or at least make them significantly less expensive.

Here's an Atlantic article that attempts to explain how.
https://www.theatlantic.com/busines...ending-a-penny-more-on-education/273801/