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 $510,000. His additional Medicare tax is $ 2,790 b. George and Shirley are married and file a joint return. During the year, George earns wages of $233,000, and Shirley earns wages of $349,500. Their additional Medicare tax is s X c. Simon has net Investment income of $52,960 and MAGI of $264,800 and files as a single taxpayer. Simon's additional Medicare tax is