The dinner plates cost 20*.5=$<<20*.5=10>>10

So he paid 10+20=$<<10+20=30>>30

# Answer

30
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John buys dinner plates and silverware.  The silverware cost $20.  The dinner plates cost 50% as much as the silverware.  How much did he pay for everything?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
30
John buys dinner plates and silverware.  The silverware cost $20.  The dinner plates cost 50% as much as the silverware.  How much did he pay for everything?
train