compute the additionalmedicare tax for the following taxpayers. if required, round your answers to the nearest dollar. a. mario, who is single, earns wages of $440,000 in 2022. his additional medicare tax is $fill in the blank 1 . b. george and shirley are married and file a joint return in 2022. during the year, george earns wages of $138,000, and shirley earns wages of $210,000. their additional medicare tax is $fill in the blank 2 . c. simon has net investment income of $38,000 and magi of $223,000 and files as a single taxpayer. simon's additional medicare tax is