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?
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
#### 1000