3. On December 30, Nancy Sheridan hired an employee, Tom Shanahan, to help her with the medical billing. His first weekly pay period ends January 7 and he will be paid on January 14. He earns $17.25 per hour. During the 40-hour weekly pay period, Tom worked 48 hours. His Federal income tax is $122. Social Security tax is 6.2% and Medicare tax is 1.45%.