69,472
The best I could do, with several hours of research on these damn Economics questions, was 22.5/24 and 18.2/19. Small numbers, but the class does shit like "Let's put 20 questions, in a single question, then we'll split up those points among all the possibilities where you could screw up".
Mind you, none of these questions were explained to you, at any point, before you tried to do them, it's a one-shot deal.