hello please help answer this question and also help me understand how I know which earnings are taxable for Medicare, thanks !!

The monthly salaries for December and the year-to-date earnings of the employees of Bush Consulting Company as of November 30 follow. Determine the amount of Medicare tax to be withheld from each employee's gross pay for December. Assume a 1.45 percent Medicare tax rate and that all salaries and wages are subject to the tax. (Round your final answers to 2 decimal places.)