Compute the additional Medicare tax for the following taxpayers. If reguired, round your answers to the nearest dollar. a. Mario, Who is single, earns wages of $389,000. His additional Medicare tax is 1 b. George and Shirley are married and file a foint return, During the year, George earns wages of $171,000, and 5 hidey earns wages of 5256,500 Their additional Nedicare tax is 1 c. Simon has net investment income of 345,960 and Masct of 4229,1000 and files as a tingle taxpayer: Smon's additional Medicare tax ls 1