An employee works 39 regular work week in August 2018. He was hired six years ago, earns a salary of $116.500/year and is exempt from the overtime provisions of the FLSA. to date he has no compensatin beyound his annual salary. He ask the employer to withhold 12% of gross pay, which is to be contributed to a 403b plan. Taxable income for federal income tax withholding? Taxable income for Social Security tax? Taxable income for medicare tax?