Условие:
Alvin is thinking of going to an e-sport match online which will last 1.5 hours. He could tutor students for HKD 111 per hour if he does not go to the match. Alternatively, he could use the same time to work as a part-time waiter in a restaurant instead and earn a total of HKD 295. He enjoys the tutoring job and waiter job just enough that he is willing to pay for his additional MTR fare of HKD 10, to reach either job and do it for free.
\nIf the price of the e-sport match ticket is HKD 210, his opportunity cost of going to the e-sport match is HKD
