Depends on how many credits for each class. If they're all 3 credits each, 4*3 + 4*3 + 4*3 + 4*3 + 3*3 + 3*3 + 3*3 + 2*3. (grade*how many credits the class is worth)
What's An A+,A,A,A,B,B,B,C+ GPA?