The internal resistance of a battery is relatively small when the battery is new but increases as the battery ages. When a new \(12.0-\mathrm{V}\) battery is attached to a \(100-\Omega\) load, the potential difference across the load is \(11.9 \mathrm{~V}\). After the circuit has operated for a while, the potential difference across the load is \(11.5 \mathrm{~V}\). By how much has the internal resistance of the battery changed?