Marcy has an 85% average in the class going into the final exam that is worth 30% of the grade. If Marcy makes a 100% on the final exam, what is her final grade average for the course?

89.5%

Explanation:

If Marcy final exams is worth 30% of the grade, then (100 - 30) % must be for others such as quizzes, assignments, and CA

Her final score therefore = ((85/100) * 70%) + 30% since she made 100% in her final exams = 59.5 % + 30% = 89.5%