Compute the additional Medicare tax for the following taxpayers. If required, round your answers to the nearest dollar. a. Mario, who is single, earns wages of $534,200. His additional Medicare tax is $ b. George and Shirley are married and file a joint return. During the year, George earns wages of $236,100, and Shirley earns wages of $354,150. Their additional Medicare tax is $ c. Simon has net investment income of $50,160 and MAGI of $250,800 and files as a single taxpayer. Simon's additional Medicare tax is $