James Silverton wrote: In my
> lifetime, I've seen tipping percentages creep up from 10% or less and,
> of course, seen the innumerate argument that larger percentages are
> needed because of rises in the cost of living.
>

In my life I've never known of tips to be suggested at only 10%. It was
suggested at 15% long ago, but I read and hear it suggested at 18% now.
I usually do 20%.