If you get called in as a sub for another contractor, what price do you charge the other contractor?

As an example, at the FD I work with a guy who runs a landscape business. there have been times when he's sold the customer the idea of lighting as a part of his patio/wall projects, and he's turned to me as the EC to do the electrical side of the job.

I'm not going to get into the various problems I have with his methods sice he's a buddy (they're numerous, but I'll wait for the payout and a sit-down over coffee with him to discuss his "estimating" methods [Linked Image] )... I've asked a few other guys in the area and they've so far all agreed that as a "courtesy" they knock a % off of their normal billable hourly rate.

Just curious.

Doug W