A road has a rise of 6 feet for every horizontal run of 80 feet. What is the slope of the road in percent grade?

Step 1 ：Step 1: Calculate the slope of the road. The slope is the ratio of the vertical change (the rise) to the horizontal change (the run). So, the slope is \( \frac{6}{80} = 0.075 \).

Step 2 ：Step 2: Convert the slope to a percent grade. Multiply the slope by 100 to get the percent grade. So, the percent grade is \( 0.075 \times 100 = 7.5\% \).