What is the tens digit in the sum $11^1 + 11^2 + 11^3 + \ldots + 11^9$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
What is the tens digit in the sum $11^1 + 11^2 + 11^3 + \ldots + 11^9$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
5
What is the tens digit in the sum $11^1 + 11^2 + 11^3 + \ldots + 11^9$?
train