>>>I'm pretty much the same way. (Plus, I can't do actual math in my head to save my life, so I'm always liberal...oh my god, did I just admit I'm a liberal???)
>
>LOL. So pity the foreigner who is not used to math at the end of a nice dinner out.;-)
>
>FWIW I tend to shift the decimal point for 10% then half it and then halve that, adding to 17.5% and rounding up all the way. I take if from the tax-inclusive price including alcohol, though some older conservative associates insist it's supposed to be 15% on the pre-tax cost of the meal only. From what I'm seeing here maybe I'm a bit cheap.

FWIW, my 20% is typically on the pre-tax total.

Tamar