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 $584,800. His additional Medicare tax is $ 8,468 b. George and Shirley are married and file a joint return. During the year, George earns wages of $211,300, and Shirley earns wages of $316,950. Their additional Medicare tax is $ c. Simon has net investment income of $56,880 and MAGI of $284,400 and files as a single taxpayer. Simon's additional Medicare tax is $