Here is a minimal sample plan for in-state Florida college (where we didn't screw things up):
Insurance - covered at the student health center (catastrophic covered by parent)
Food - $100/month, rice/beans (my budget as an adult) - $1200/year
Tuition - 39credits/year @ 212.28/cr = $8.2K/year (source: http://tuitionfees.ikm.ucf.edu...)
Transportation - Bicycle, SERIOUSLY
Housing - offcampus w/shuttle @ $600/month (includes utilities and roommates, "luxury living" source: http://www.livesomewhere.com/c...) - $7.2K/year
MISC - haircuts, bike repairs, incidentals, pocket money, $100/month = $1200/year
Cost - 17.8K/year.
But how will someone ever pay for this?
Part time job at campus library at lowest-salary-university-will-pay-you. 20hours/week @ $8/hour = $8K/year.
Assuming that tuition never goes up and the student never obtains a marketable skill (dishwashing @ $10/hour, CAD drawing at $12/hour, copywriting @ $15/hour, freelance website design @ $20/hour, etc.), college costs about $10K/year, or $40K for the total package.
Note that a "student paying their own way, working their through college on minimum wage" is actually an option. Minimum wage is nearly $8/hour. 40 hours of minimum wage is $16K/year, which is just enough to cover college when considering the Earned Income Tax Credit and Making Education Pay Tax Credit.
Additionally note that no scholarships were to be had in the above calculations. Florida has a program called "Bright Futures" whereby a student with 1170 SAT score can get tuition 100% covered for all 4 years of college (cost reduced to $10K/year).