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Because I think HN likes data I plotted some for ease. We can see that by linear fit the cost grows 2.5 times that of the number of students. The 2015 cost of school is 3.5 times that in 1990. The 2015 number of students is 1.47 that of 1990 students.

Graph: https://i.imgur.com/Udj3leD.png

Sources from: https://nces.ed.gov/programs/digest/d15/tables/dt15_330.10.a...

https://nces.ed.gov/programs/digest/d15/tables/dt15_105.20.a...

Note* 2015 students were estimated and slope is from linear fit.



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