Final answer:
The question from mathematics concerns the additional federal income tax to be withheld after a pay increase assuming the individual is single and claims 1 allowance. Due to a typo in the increase percentage and a lack of detailed tax information.
Step-by-step explanation:
The subject of this question is mathematics, as it involves calculating the difference in federal income tax withholding due to a change in weekly pay. Given that you are single, claim 1 allowance, and currently earn $520 per week, but will receive a 1% increase to earn $646 per week, you wish to calculate how much more will be withheld from your weekly paycheck for federal income tax. It appears there is a typo in the question regarding the increase percentage because 1% of $520 is $5.20, which would not result in a new weekly pay of $646. Instead, we will calculate the increase as if going from $520 to $646 is indeed a 1% increase, although mathematically it isn't.
Let's assume that the 1% raise is accurate and your new pay will in fact be $646 per week. To find out the additional federal income tax withheld due to the pay increase, we would need to understand your current tax withholding and the new withholding rate based on $646. This generally requires information about federal tax brackets and how they apply to your taxable income. However, without knowing the exact withholding tax rates or if there are other income factors to consider, we cannot accurately determine the amount of additional federal income tax withholding that would result from a 1% pay increase. Therefore, to provide a detailed and correct answer, it is necessary to have the current tax withholding rates or your precise taxable income after deductions and exemptions.