Average undergraduate tuition and fees and room and board rates

Source: http://nces.ed.gov/

These figures are inflation adjusted and look how just the tuition fees have increased compared to the Dorm and Board rates

Now comparing the rate increase for 2-year program

So for the 2 year program, the board rates have remained at the same level compared to the dorm rates.

Now check out the interesting graph for 4 year program below

Comparing the slope of 2 year Board rates to the 4 year Board rates, the 4 year has significant increase

If price of meals is same for both programs then both 4 year and 2 year programs should have the same slope. So why is the 4 year slope different than 2 year?

Now, let see about the Dorm rates

And finally the 4 year vs 2 year Tuition rates

Here is the data table for the above visualization