The marginal tax bracket of Dave shows that the amount of the federal tax is $28000.
Let the federal tax be represented by x.
From the information, Dave’s marginal tax bracket is 25%, and he contributed 7000.
Based on the information, the amount will be:
25% of x = 7000
0.25 × x = 7000
0.25x = 7000
x = 7000/0.25
x = $28000
In conclusion, the amount is $28000.
Learn more about tax on:
https://brainly.com/question/25783927