A$.$Chris and Casey, married filing jointly, earn $$300,000$ in salaries and do not have any net investment income.

$(1)$How much in surtax will Chris and Casey be assessed on their Form $1040$ for $2021?$

Chris and Casey, married filing jointly, earn $$214,500$ in salaries and $$50,000$ in capital gains, $$50,000$ in dividends, and $$25,000$ in savings interest for a total modified AGI of $$339,500.$

$(1)$How much in surtax will Chris and Casey be assessed on their Form $1040$ for $2021?$

Chris and Casey, married filing jointly, earn $$336,000$ in salaries and $$56,000$ in capital gains for a total modified AGI of $$392,000.$

$(1)$How much in surtax will Chris and Casey be assessed on their Form $1040$ for $2021?$a