Final answer:
Harriet Knox's gross pay for this week is $515. To determine the amount that will be withheld from Knox's pay for federal income tax, we need additional information.
Step-by-step explanation:
For tables where tax is expressed as a base amount plus a percentage over a threshold (as in the last provided info snippet), if her taxable income were $20,000, she would calculate her taxes owed as 837.50 + 0.15 × (20,000 - 8,375), which equals $2,581.25. In practice, to determine the withheld amount for Harriet Knox, we would similarly need her taxable income and the specific tax withholding table that applies.
$515 is Harriet Knox's gross pay for this week. She is single and claims one allowance. To determine the amount that will be withheld from Knox's pay for federal income tax, we need to refer to figure 2.3. However, since figure 2.3 is not provided, it is not possible to provide an exact answer without the necessary information.