President Biden proposed increasing the corporate tax rate from 21% to 28%. However, this reform has been hard to pass in the Senate.

President Biden proposed increasing the corporate tax rate from 21% to 28%. However, this reform has been hard to pass in the Senate.
Imagine he asks you to predict revenue changes as a result of a lower increase in the corporate tax (from 21% to 24%). What kind of basic information would you need to make such predictions?