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 $404,400. His additional Medicare tax is $............

b. George and Shirley are married and file a joint return. During the year, George earns wages of $192,700, and Shirley earns wages of $289,050. Their additional Medicare tax is $fill ..............

c. Simon has net investment income of $58,280 and MAGI of $291,400 and files as a single taxpayer. Simon's additional Medicare tax is $............