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 $440,000 His additional Medicare tax is $ b. George and Shirley are married and file a joint return During the year, George earns wages of $138,000, and Shirley eams wages of $210,000 Their additional Medicare tax is $ c. Simon has net investment income of $38,000 and MAGI of $223,000 and Mes as a single taxpayer Simon's additional Medicare tax is s