Reasonable price for fuel filter replacement?
 

I'd like to know what you all think would be a reasonable rate to charge for a fuel filter replacement. I've done my own before on my old 93, so I know what it entails. I just don't know what to charge someone else.
The car is up on car ramps in a shed. That's where I'll be working on it, not on a lift or all the way on the ground.