In​ Marissa's calculus​ course, attendance counts for 5​% of the​ grade, quizzes count for 15​% of the​ grade, exams count for 60​% of the​ grade, and the final exam counts for 20​% of the grade. Marissa had a 100​% average for​ attendance, 89​% for​ quizzes, 82​% for​ exams, and 85​% on the final. Determine​ Marissa's course average.