suppose your expenses for this term are as follows: tuition: $10 000, room and board: $6 000, books and other educational supplies: $1 000. further, during the term, you can only work part-time and earn $8 000 instead of your full-time salary of $20 000. what is the opportunity cost of going to university this term, assuming that your room and board expenses would be the same even if you did not go to university?