human
John buys dinner plates and silverware. The silverware cost $20. The dinner plates cost 50% as much as the silverware. How much did he pay for everything?
assistant
How much did the dinner plates cost? ** The dinner plates cost 20*.5=$<<20*.5=10>>10
How much did John pay for everything? ** So he paid 10+20=$<<10+20=30>>30
#### 30