Briana is trying to decide whether to take a job or stay in school for an extra year to get her master's degree. She has two job offers, one paying $56,000 and one paying $66,000. If she stays in school, she will pay another $12,000 in tuition expenses. Regardless of her choice, she expects food and living expenses to be $16,000. 

(a) What is her opportunity cost of staying in school for an extra year? Briana's opportunity cost of staying in school is $ Number 

(b) What expense is most likely a sunk cost? Briana's sunk cost of $ 16,000 is her food and living expenses