The cost of the hearing aids is $2500 * 2 = $<<2500*2=5000>>5000

So insurance covers $5000 * .8 = $<<5000*.8=4000>>4000

That means it cost him $5000 - $4000 = $<<5000-4000=1000>>1000

# Answer

1000
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
John ends up damaging his hearing aids.  He needs to replace both of them.  They cost $2500 each.  Insurance covers 80% of the cost.  How much does he personally have to pay?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
1000
John ends up damaging his hearing aids.  He needs to replace both of them.  They cost $2500 each.  Insurance covers 80% of the cost.  How much does he personally have to pay?
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