In 20 years, if average public college (in-state) costs rise at 5.0% a year, the annual cost for your kid’s education will be $34,071 (up from $12,841 today). The total cost for 4 years will then be $146,850. The same scenario for your kid attending a private school, will cost you $73,435 annually (up from $27,677). The total cost for 4 years will then be $316,515.

Source: CollegeBoard.com – College Cost Calculator.