Gus is the self$-$employed owner of Four Paws Pet Supply. His estimated annual earnings are $$49,280\mathrm{.}00$ and he expects to pay $19\%$ of this amount in income tax. What will be his quarterly estimated tax payment for the second quarter? $($For self$-$employed persons, Social Security tax is $12\mathrm{.}4\%$ of wages up to $$128,400,$ and Medicare tax is $2\mathrm{.}9\%$ of all wages.$)$