You are studying for your final exam of the semester. up to this point you recived 3 exam scores of 99%, 80% and 70%. to revive a grade of b in the class you must have an average score between 80% and 89% for all exams including the final. find the widest range of scores that you can get on the final exam in order to recive a grade of b in the class.
a: 62,100
b: 71,100
c: 74,97