$70k is total expenses for most 4-year residential universities. E.g. https://student-accounts.yale.edu/tuition-and-fees https://student-accounts.yale.edu/tuiti

$70k is total expenses for most 4-year residential universities. E.g. https://student-accounts.yale.edu/tuition-and-fees https://student-accounts.yale.edu/tuition-and-fees [yes, this is typical even for schools less elite than Yale]