the example receipt from the article shows a frustrating concept that has always bothered me. the included 20% gratuity value is actually 20% of the after-tax total, not the pre-tax total. what logic would exist to tip on any sort of tax?
Probably the same reason that stuff I order internationally and pay import duty on invariably includes the cost of delivery (which can be £50+ for US reasonably-fast shipping) as the 'package value' declaration.
I can't easily imagine a system where this makes sense.
