Answer
$\approx 29.39\%$
Work Step by Step
Change in elevation: $14255-9600 = 4655$ ft
Horizontal Distance: $15,840$ ft
The average grade can be found by dividing the change in elevation by the horizontal distance, then converting the answer to percent:
Average Grade $= \dfrac{4655\text{ ft}}{15840\text{ ft}}=\dfrac{931}{3168}=0.2938762626 \approx 29.39\%$
