class has a grading policy where the categories have the following worth:

Category	Worth	Scores in each category
Quizzes	25%	7/10, 8/12, 10/10, 12/15, 11/15
Unit test	55%	78/100, 81/100, 86/100
Final test	20%	?

a. Calculate the average for the quiz category

b. Calculate the average for the test category

c. Calculate the student's grade as it stands before the final test.

d. What final test grade will this student need to get an 80% B in this class?

e. This student scored an 81% on the final. Find their overall grade as a percent?