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The graph below represents the budget line for Kim, who spends all of her income on books and video games.
Jane Schaefer. Created for Albert.io. Copyright 2016. All rights reserved.
Kim is currently buying 8 books and 16 video games. What is the opportunity cost for Kim if she increases her purchase of books by 4 units?
$4$ video games
$8$ video games
$12$ video games
$16$ video games
$20$ video games