Julia's favorite hockey team is playing Saturday night.  Julia usually works on Saturday nights at a restaurant where she earns $16.50 per hour and she works for six hours.  A ticket to the hockey game will cost $137 and if she goes she will not be able to work at the restaurant.  The game will last for two hours.  If she goes to work she can eat for free, but if she goes to the game she will have to buy food for $24.  To get to either the game or to work she will have to pay $3.70 for the bus.  What is Julia's opportunity cost if she goes to the hockey game?