Using proportions, it is found that the federal income tax withheld each week is given by $24.69.
The rates for a married person are given as follows:
Additionally, we have that:
A proportion is a fraction of a total amount, and the measures are related using a rule of three. Due to this, relations between variables, either direct(when both increase or both decrease) or inverse proportional(when one increases and the other decreases, or vice versa), can be built to find the desired measures in the problem, or equations to find these measures.
Removing the allowances, the taxable amount is:
390.50 - 2 x 63.46 = $263.58.
Hence, applying the rates, the withheld amount is given by:
14.40 + 0.15(263.58 - 195) = $29.69.
The federal income tax withheld each week is given by $24.69.
More can be learned about proportions at https://brainly.com/question/24372153
#SPJ1