Martin is married and claims four exemptions on his W-4. What is his federal income tax withholding under the following conditions? Use the percentage method table in the Appendix to this chapter.
a. Martin is paid semimonthly, and his gross pay is $3,500 per paycheck.
b. Martin is paid monthly, and his gross pay is $6,400 per paycheck.
c. Martin is paid weekly, and his gross pay is $4,750 per paycheck.