A site rises 50 feet over a horizontal run of 400 feet. What is the grade percentage?
Correct Answer
C) 12.5 percent
Grade percent=(50 ft/400 ft)×100=12.5%. Common errors: inverting the ratio (run ÷ rise) gives 800.0 percent; misplacing the decimal (×10 instead of ×100) gives 1.3 percent; dividing by the slope length instead of the horizontal run gives 12.4 percent.
Why This Is the Correct Answer
Grade percent=(50 ft/400 ft)×100=12.5%. Common errors: inverting the ratio (run ÷ rise) gives 800.0 percent; misplacing the decimal (×10 instead of ×100) gives 1.3 percent; dividing by the slope length instead of the horizontal run gives 12.4 percent.
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