Martin is married and claims four exemptions on his W-4. What is his federal income tax withholding under the following conditions? Assume that his employer uses the percentage method of withholding. Usewithholding allowance and tax table. (Round your intermediate computations and final answers to 2 decimal places.)

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.