How many whole numbers between 99 and 999 contain exactly one 0?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
How many whole numbers between 99 and 999 contain exactly one 0?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
162
How many whole numbers between 99 and 999 contain exactly one 0?
train