<human>:  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?
<bot>: How much do the hearing aids cost? ** The cost of the hearing aids is $2500 * 2 = $<<2500*2=5000>>5000
How much does insurance cover? ** So insurance covers $5000 * .8 = $<<5000*.8=4000>>4000
How much does he personally have to pay? ** That means it cost him $5000 - $4000 = $<<5000-4000=1000>>1000
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