9/15 is 60 percent, hope this helped.

[latex]1\%\ \ \rightarrow\ \ \frac{1}{100} \\x\ \ \rightarrow\ \ \frac{9}{15} \\\\x= \frac{ \frac{9}{15}\cdot1\%}{\frac{1}{100} } \ \ \ \Rightarrow\ \ \ x=\frac{3}{5}\cdot1\%\cdot100=3\cdot1\%\cdot20=60\%\\\\Ans.\ 60\%[/latex]