Debra

It's been a while since I did this, so check me on this

If you want to pay someone whose gross g is $1000 enough so that
after paying a tax rate r of .05 they still get $1000, you can do something like this

g = 1000
r = .05

newrgross = g / ((g-(g *r))/g)

Maybe some math types can simplify that, but I think it will work