In Canada, Charles, $51-$years old, received $$8,335\mathrm{.}44$ of EI benefits in $2022.$ His net income before adjustments $($i$.$e$.$ Line $23400)$ is $$81,000.$ How much of his EI does Charles have to repay?

$$0$

$$1,687\mathrm{.}50$

$$2,500\mathrm{.}63$

$$5,625\mathrm{.}00$