In​ Marissa's calculus​ course, attendance counts for 20​% of the​ grade, quizzes count for 20​% of the​ grade, exams count for 45​% of the​ grade, and the final exam counts for 15​% of the grade. Marissa had a 100​% average for​ attendance, 89​% for​ quizzes, 86​% for​ exams, and 85​% on the final. Determine​ Marissa's course average.

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