A degree program costs $50,000 in total expenses: $30,000 in tuition and $20,000 in housing and books. The U.S. government provides a $10,000 grant for the tuition. Moreover, the university pays $20,000 of the $30,000 tuition in salary to your instructors. Because being in the program is so much fun, you would be willing to pay a net of $5,000 for the pleasure, relative to your alternatives. What is the net cost of the education to you?