For your benefit, I'm adding a link to a printable tip table. I've seen these for sale at certain stores. They are about the size/durability of a credit card. It will help with the calculations on 15% and 20% tips. If you want to give 25%, just divide the 20% number by 4 and then add it to the 20% number.
Standard tipping in the US is 15 - 20%; however, large parties in restaurants usually get an automatic gratuity of 18%.
http://www.itipping.com/free-tip-table.htm
my 2 cents...
dave
Great idea very helpful, I'll be taking that with me.
Thanks to all for your advice. It is important to me that servers get a decent tip if they do a good job especially since I know I could never do that job half as well as the servers I usually get at Disney.