Originally Posted by gayl
I'm too lazy to do the math so I just leave dbl tax (9%) & round up
First, I write down the amount of the bill, pre-tax, but after adding-in any discounts. This adding-in the free stuff is important if you're doing groupons and things like that. Or we have places with loyalty credits. So if the bill was $45 and we got two half-priced beers (a $5 value), I'd write down 50, then write down half of that, so I'd write 25, and add the two (in my head) to get 75. So that's the least
tip I'd give: $7.50. If you leave the receipt, the server might see those two numbers (50 and 25) and might not even know what you were doing. It's easy to do 2*50 or 3*50 (in my head) if the service was great, or if it's a place we come back to often, or they ask me how my kids are doing, lol!