If you mean 100% grade, the answer is a 45 degree angle.
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100% or A+
This means that for every 100 units of distance forward, you go 80 units up. (you have to go about 128.06 along the slope to do this) This is an angle of 38.66 degrees.
180-100=80 degree angle
Fail.
The answer depends on the grade boundaries.