Exercise 13-25 (Algorithmic) (LO. 7) 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 $433,000 in 2018. His total Medicare tax is $ 8,375 x. b. George and Shirley are married and file a joint return in 2018. During the year, George earns wages of $276,400, and Shirley earns wages of $414,600. Their total Medicare tax is $ 12,639 X. c. Simon has net investment income of $50,720 and MAGI of $253,600 and files as a single taxpayer. Simon's additional Medicare tax is $ 1,927