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 $490,200. His additional Medicare tax is $

b. George and Shirley are married and file a joint return. During the year, George earns wages of $242,300, and Shirley earns wages of $363,450. Their additional Medicare tax is $

c. Simon has net investment income of $48,760 and MAGI of $243,800 and files as a single taxpayer. Simon's additional Medicare tax is $

For Tax Year 2022.