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Jack has a ticket to see Bo Bice for which he paid $30 yesterday. He takes an unpaid day off from work to get ready for the concert. When he arrives at the concert, five different people offer him $70 for his ticket. Jack decides to keep his ticket. The cost to Jack of seeing Bo Bice is: A). $30. B). $40. C). $70. D). $70 plus his forgone earnings. E). $350.