Our grading scale

I've been receiving quite a few questions about the grading scale, which I reproduce below. Remember, however, that I record your grades numerically; this means that there are no letter grades involved until the very end of the semester, when I transform your total numerical grade into a letter.

A 100 to 93
AB 92 to 88
B 87 to 83
BC 82 to 78
C 77 to 70
D 69 to 60
F 59 to 0