He lost 220*.1=<<220*.1=22>>22 pounds

So after gaining some weight back he was 22-2=<<22-2=20>>20 pounds lighter than before

So his weight is 220-20=<<220-20=200>>200 pounds

# Answer

200
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John weighs 220 pounds when he starts exercising.  He manages to lose 10% of his body weight.  He then gains back 2 pounds.  How much does he weigh at the end?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
200
John weighs 220 pounds when he starts exercising.  He manages to lose 10% of his body weight.  He then gains back 2 pounds.  How much does he weigh at the end?
train