SOLUTION: Hilly areas often have road signs giving the percentage grade for the road. A 5% grade, for example, means that the altitude changes by 5 feet for each 100 feet of horizontal dista

Question 567352: Hilly areas often have road signs giving the percentage grade for the road. A 5% grade, for example, means that the altitude changes by 5 feet for each 100 feet of horizontal distance.
What percentage grade should be put on a road sign where the angle of elevation of the road is 3 degrees?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
We have

, that is, for every 100 ft in horizontal distance, the altitude changes by about 5.24 ft, so the grade is 5.24%. Here, it is appropriate to round to 5%.
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