It depends on the grading scale but most of the time is a low "B"
Common grade scale by percent
100-90=A
89-80=B
79-70=C
69-60=D
59 and below=F
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66% is a D grade and 99% is an A grade.
how to convert slope into percent grade
1, 2, 4, 5, 10, 20, 401, 802, 1604, 2005, 4010, 8020
60 percent would normally be a grade of D.
Definetly an A grade.