Justin graduates from high school in one month. He already has an offer for a full-time job that would pay $25,000 a year. He is also considering going to college for the next four years. Tuition is $8,000 a year. Room and board is $10,000 annually. If he works, he will not be able to make more than $3,000 a year doing part-time and summer work. Opportunity cost involves what is given up. What is the opportunity cost of attending college – explain in words, not mathematically?