Interior Designer referral fees? I'm a designer and I am swamped with work right immediately. I...

I'm a designer and I am swamped with work right immediately. I have a potential client that I'd close to to refer to another designer that I know (she also has her own business). What percentage is customary to ask for? How in the region of for future job she gets from referral from the client?
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Answers:    You are better off hiring her to aid you with this client, afterwards you get the adjectives referrals. The potential client requests you.