Answer:
5000
Step-by-step explanation:
According to Wikipedia, the percent measureof a road grade is 100 times rise over run. in your case you know everything but run, so let's set up an equation
4=100 * 200/ run
Now just use algebra
4 = 20000/ run
run* 4= 20000
run= 20000/4
run= 5000
let me know if you didn't understand anything.
