Answer:
9%
Explanation:
Now, to get the percentage that did not complete the marathon, we need to subtract the number of racers who completed from the total. This is 230 - 209 = 21
It means 21 did not complete the marathon. They were either disqualified or gave up while on the race.
Hence, the percentage would be 21/230 * 100%
21/230 * 100 = 9%