Try more like $25k per year for a public state school nowadays, unless you commute from home. At least that's what it costs at the public state university I graduated from (Illinois State). According to their site for Freshman starting Fall 2019: Tuition and Fees: $14k, Room and Board: $10k. They added on Personal Expenses, Books, and Transportation in their estimate as well and got $31k per year.
When I first went to that college in the late 90s, it was $6k a year, including room and board. I had a full-ride scholarship (which I wasn't able to hang on to for more than 3 semesters, but that's another story), and it was going to pay $24k total for all four years. Now it's that much for 1 year.
By the way, if tuition followed inflation AT ALL (i.e. I checked an inflation calculator), the cost would have only increased to $9k a year, including room and board. Clearly the price tag of college has just increased out of control for the past 20 years.
https://financialaid.illinoisstate.edu/paying/cost/table-gro...