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75% or C
F
-8 5
They will be in Grade 3 . Grade 1 : 6 Grade 2 : 7 Grade 3 : 8 Grade 4 : 9 Grade 5 : 10 Grade 6 : 11 Grade 7 : 12 Grade 8 : 13 Grade 9 : 14 Grade 10 : 15 and so on.
Grade is simply rise over run. In your case, rise is 0.4ft and run is 5 ft. Thus the grade is 0.4/5 = 0.08, or 8% grade.