Trevor had been working full-time when he made the decision to go back and finish his degree this coming school year. If he continued to work full-time during the school year, his salary would have been $31,000. Trevor's employer agreed to pay 50% of his $10,000 tuition cost but he must pay all other costs on his own. His books cost $1,450 and other education fees are $700. Trevor's employer also allowed him to work part-time during the school year and earn 50% of his original salary. Based on the given data, what is Trevor's opportunity cost of finishing his degree?

Select one:

a. $34,350

b. $22,650

c. $17,650

d. $43,150

e. $33,150

f. $27,650

g. $18,850