I regard the letter grades as what the university requires me to turn in but your real grade is the numerical one. So the course grade is calculated by calculating the numerical average at the end of the semester and converting that to a letter grade.

96-100 A+

90-95 A

85-89 A-

80-84 B+

75-79 B

70-74 B-

67-69 C+

63-66 C

60-62 C-

57-59 D+

53-56 D

50-52 D-