He bought 3*12=<<3*12=36>>36 eggs

So they cost 36*.5=$<<36*.5=18>>18

# Answer

18
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tim buys 3 dozen eggs.  Eggs cost $.50 each.  How much did he pay for eggs?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
18
Tim buys 3 dozen eggs.  Eggs cost $.50 each.  How much did he pay for eggs?
train