solution: The grade level in which the number of male bus riders is closest to $135\%$ of the number of female bus riders is the same grade level in which the percentage of male bus riders is closest to $135\%$ of the percentage of female bus riders. To find what percentage is $135\%$ of the percentage of female bus riders, we multiply each percentage by $1.35.$ In ninth grade, the percentage is $39.4\cdot1.35=53.19$ percent. In tenth grade, the percentage is $33.1\cdot1.35=44.685$ percent. In eleventh grade, the percentage is $13.8\cdot1.35=18.63$ percent. In twelfth grade, the percentage is $8.6\cdot1.35=11.61$ percent. From inspection, we see that $135\%$ of the percentage of female bus riders in twelfth grade is closest to the percentage of male bus riders in twelfth grade. So the answer is $\boxed{12}.$
prompt.content: <|im_start|>system
  You are a helpful assistant.<|im_end|>
  <|im_start|>user
  The data in the table below shows the percent of bus riders in a survey of Central H.S. students; 300 males and 300 females in each grade were surveyed. For which grade is the number of its male bus riders closest to $135\%$ of the number of its female bus riders? \begin{tabular}{|l|c|c|}\hline
  Grade & Males & Females \\ \hline
  $9^{\mathrm{th}}$ grade & $41.1\%$ & $39.4\%$ \\ \hline
  $10^{\mathrm{th}}$ grade & $34.4\%$ & $33.1\%$ \\ \hline
  $11^{\mathrm{th}}$ grade & $20.6\%$ & $13.8\%$ \\ \hline
  $12^{\mathrm{th}}$ grade & $11.6\%$ & $8.6\%$ \\ \hline
  \end{tabular}
  Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
  <|im_start|>assistant
  
prompt.role: user
extra_info.answer: 12
extra_info.question: The data in the table below shows the percent of bus riders in a survey of Central H.S. students; 300 males and 300 females in each grade were surveyed. For which grade is the number of its male bus riders closest to $135\%$ of the number of its female bus riders? \begin{tabular}{|l|c|c|}\hline
  Grade & Males & Females \\ \hline
  $9^{\mathrm{th}}$ grade & $41.1\%$ & $39.4\%$ \\ \hline
  $10^{\mathrm{th}}$ grade & $34.4\%$ & $33.1\%$ \\ \hline
  $11^{\mathrm{th}}$ grade & $20.6\%$ & $13.8\%$ \\ \hline
  $12^{\mathrm{th}}$ grade & $11.6\%$ & $8.6\%$ \\ \hline
  \end{tabular}
extra_info.split: test