The weight stack weighed 10*30=<<10*30=300>>300 pounds

So the added weight made it 300*.2=<<300*.2=60>>60 pounds heavier

So when he lowered the weight it was 300+60=<<300+60=360>>360 pounds

# Answer

360
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Tom uses 10 weight plates each weighing 30 pounds on an exercise machine.  This exercise machine uses special technology to make the weights 20% heavier on the lowering portion.  How heavy did the weights feel when being lowered?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
360
Tom uses 10 weight plates each weighing 30 pounds on an exercise machine.  This exercise machine uses special technology to make the weights 20% heavier on the lowering portion.  How heavy did the weights feel when being lowered?
train