Sine of the angle to its cosine.
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0.75 equals 75/100 which equals 3/4
15%ramp is a rise of 15/100 = 0.15 slope angle is inverse tangent of this, or 8.53 degrees
That means that for every 100 meters horizontally, you go 5 meters up. Mathematically, it is the tangent of the angle.
8 : 10 = 16 : 20
8 to 5 = 160%