I usually tip 15-20%, less if the service is weak. One chinese restaurant I used to frequent had very friendly and helpful waiters, I would tip $4-5 for a bill that usually came to around $20, and they often gave me free appetizers, free beer (even when I was 16), and free dessert, and I would leave a tip of $10-15 usually.
I never tip based on the gender/age of the person receiving the tip. I am male.
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