In a certain competition, participants are awarded points in three different categories. The points are awarded as follows: 
- Category A: 12 points for each correct answer
- Category B: 8 points for each correct answer
- Category C: 5 points for each correct answer

If a participant answered 7 questions correctly in Category A, 10 questions correctly in Category B, and 15 questions correctly in Category C, how many total points did the participant earn? Let's think step by step and output the final answer within \boxed{}.
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