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 $466,000 in 2018 His total Medicare tax is b. George and Shirley are married and file a joint return in 2018. During the year, George earns wages of $220,600, and Shirley earns wages of $330,900 Their total Medicare tax is C. Simon has net investment income of $49,320 and MAGI of $246,600 and files as a single taxpayer. ) Simon's additional Medicare tax is