Let's say someone gets a raise which increases his or her earnings
enough to definitely move him or her into a higher tax bracket. Will
the entire salary be taxed at the new higher rate? Give an example to
justify your answer. To put your example together, use the percentage
chart method. Assume no other deductions. Choose one tax bracket to
calculate the taxes. For the second part of your example, add enough
to the pay to force going into the next tax bracket.

I think this question is mis-classified - it probably needs to be in
homework/test questions.....

Only the amount that is into the next tax bracket is taxed at the
higher marginal tax rate.

Is it possible to give an example.  It would be much appreciated for clarification.