Barbri company ordinarily pays its employees on a weekly basis. recently, one of the employees, bernard nagle, was sent from the home office on a three-week trip. nagle has now returned to the office, and you are preparing a single check covering his three-week services. should you withhold federal income taxes on the total gross earnings for the three-week period, or should you compute the federal income taxes as if nagle were receiving three separate weekly wage payments?