Answer :
ANSWER
[tex]9.1\%[/tex]EXPLANATION
The total number of racers are 230.
Numbers of those that did not finish the marathon is;
[tex]230-209=21[/tex]The percentage that did not complete the marathon;
[tex]\begin{gathered} \frac{21}{230}\times100 \\ =\frac{2100}{230} \\ =9.1304 \end{gathered}[/tex]