Joseph O, Neil is paid his annual bonus of 85,000. His total gross pay is 87, 307.69 = (2,307.69 + 85, 000), and his simple tax is 4,000 he is also married with 4 withholding. For withholding purposes, the bonus is considered a supplemental payment and is added to his gross pay. What is his federal tax amount due?

Please help me as I have been stuck on this assignment for over 48 hrs and I am now overwhelm, thanks for your assistance.