Question 13 (3 points) In a certain course, Bob wanted a final mark of 80%. There is a term portion of the mark, the non-exam part, which was worth 70% of the course and is determined as follows: Quizzes 20% and Tests 50%. Bob had a mark of 90% on his quizzes, 80% on his tests. What mark does Bob need on his final exam, worth 30% of the course, to get the final mark that he wants