In Marissa's calculus course, attendance counts for 15% of the grade, quizzes count for 20% of the grade, exams count for 50% 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. Marissa's course average is 00/0. (Type an integer or a decimal. Do not round.)