Answer:
a. What will be Joe’s opportunity cost of four years of college?
the opportunity cost of going to college is the money that he will lose by not being able to work = $14,000 x 4 = $56,000
b. What will be his net benefits (benefits minus costs)?
net benefits minus costs = $600,000 - $56,000 - $40,000 = $494,000
c. Should he make the investment in education?
Yes, he should. The net benefits of going to college are positive, meaning that going to college will increase Joe's wealth.