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You have two options for how to spend the afternoon. you can either go see a movie with your roommate or work as a tutor for the math department. from experience, you know that going to see a movie gives you $20 worth of enjoyment, and with your student discount, a movie ticket only costs $12. if you spend the afternoon working as a math tutor, you will get paid $45. on a typical day, you wouldn't be willing to spend the afternoon working as a math tutor for less than $35. what is your economic surplus from working as a math tutor instead of going to the movies?