In the 4 point scale GPA in USA what is the relation between mark secured, grade and point value?

The relation between marks secured and grade is decided by the teacher.
The relation between grade and point value is:
A:4
A-:3.67
B+:3.33
B:3
B-:2.67
C+:2.33
C:2
C-:1.67
D+:1.33
D:1
F:0

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