That was pretty cheap.
That being said, I hate the percentage based tipping norm. I can go to one place and get a burger and fries for $7, and tip $2 for a $9 meal, but go to another and pay $15 for a burger and tip $3 for a total of $18 for the same meal and same service.
I never understood why the more you pay for the food the more you have to tip because many places are overpriced and that just adds to it.
If I get a coke with free refills for $1.50, compared to getting 3 beers for $4.50 each, I have to pony up an additional $2 tip because of those 3 over priced beers, but the amount of service was the same.
I just wish there was a per person standard based on how long you were in the place. If I'm in a place for a couple of hours and have a $30 bill, I feel like I owe the wait staff $10 instead of $6 because of the time I spent, not necessarily the amount I was charged for food.
Just a pet peeve of mine.