Tom has purchased a non-refundable $120 ticket for a music concert in Baltimore (assume there is no pandemic). Transportation, including gas and parking, will cost $50. Unexpectedly, two opportunities have come up for the same weekend. Tom's company is looking for employees to put in overtime that weekend, and will pay $350; also, there is a consulting opportunity to earn $500. If he takes on either weekend work (he cannot do both), he would not have time for the concert, but he could sell the ticket to a friend for $100. What is the total economic cost to Tom of going to the concert? Enter a number.