how much will it cost to repair a bent rear axial

really no way to tell until you get inspection/estimate.

You need to replace it or have it straighten-up-your best shot is just replace it-

any idea how it got bent?

See the other post

I don't! But what's the price range?

$1 to $1000 depending on many variables. who does it, where it's done, what kind of parts are used.

Can give me a ballpark figure frm the highest to the lowest

We can't see it. We don't know what an "axial" is. We don't know what's needed. We can't diagnose it over a computer. You need to get an estimate from a repair shop. That's part of what they do. Given the information provided, $1.00 to $1000.00 sounds about right.