Assume you purchase a ticket to a local football game for next week at a cost of $50. Before the day of the game, you are invited to a picnic by your best friend. You would have to bring $20 of hotdogs to the picnic. You could sell the ticket to the game for $55 to a scalping company. What is the sunk cost connected with deciding whether or not to attend the picnic?
a) $5
b) $50
c) $55
d) $30