Wirelessly posted (Blackberry 7290: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/120)
What I don't quite understand I why it makes sense to tip a percentage of the bill. In some cases, the total amount is indicative of the service received (lots of courses or lots of drinks) but often it is not. For a simple lunch with a soft drink, it is posible to pay from 10 dollars (=$1.50 tip) to $40 (=$6.00 tip). In both cases, the waiter had exactly the same thing to do.
I tend to tip more as a percentage when the prices are low than when they are high.
SmilingBoy.