Hi, Kaylasole99! :)
11.25*28%
=$3.15
11.25-3.15
=$8.10
With taxes deducted, Henry makes $8.10 an hour.
To find how many hours he needs to work to make $324, we can create an equation:


Solve for x.

Divide both sides by 8.10.

Simplify.

It would take Henry 40 hours in order to make $324.
Hope this helps.
-Benjamin