Sallie earned a grade of exactly $90 \%$ for a marking period based on six equally weighed tests. The four test papers she can find have grades of exactly $83 \%$, $96 \%$, $81 \%$, and $82\%$. What is the sum of the percent scores of the two missing grades?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Sallie earned a grade of exactly $90 \%$ for a marking period based on six equally weighed tests. The four test papers she can find have grades of exactly $83 \%$, $96 \%$, $81 \%$, and $82\%$. What is the sum of the percent scores of the two missing grades?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
198\%
Sallie earned a grade of exactly $90 \%$ for a marking period based on six equally weighed tests. The four test papers she can find have grades of exactly $83 \%$, $96 \%$, $81 \%$, and $82\%$. What is the sum of the percent scores of the two missing grades?
train