Business and math question
posted by John .
Isabella is hoping to get an A on her college algebra course. With just the final exam left to take, she currently has an average of 92 on her exercises. The quizzes count for 40%, exercises count for30% of the class grade. What is the minimal grade that Isabella must have on the final exam to obtain an A in the class (90% or higher)

What is her quiz average? zero? 100?

I REALLY DON'T KNOW