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					Originally Posted by  Kevy Baby
					 
				 
				My personal rule is to take the bottom line total and add 20%. 20% is easier to figure than 25% (IMO - 10% is easiest and just double that) and it keeps things safe. Again, I know not everyone agrees with this, but it is my policy. 
			
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 Wait wait wait.
That's a 22% tip.
When we're talking #s like $730-$800, a few percent is pretty important.
It's clear that not enough money was left.  But based on that, $120 I think is somewhat exaggerated.  I just looked more closely at your math above.  You did 20% of the nearly $800 AFTER TAX amount, coming up with $160 - the $40 in change.
Well, the before tax amount would have been $730.  That would mean a tip of between $109-$146 (15-20% of $730).  Figuring that everyone's fudge factors are a little different, $125 would be a reasonable tip assumption.  Take away the $40 that was there, and it's $85 of shortage.
That's a fair bit different than $120 and is approaching a range that looks more like collective and bad estimation than incompetence and/or thievery.
Again, it's still egregiously under paid, but it's far from as bad as 
your decision to leave a more-generous-than-societally-agreed-upon tip makes it seem.  I'm not saying that a 22% tip is unreasonable, especially considering the lengths they went to to accomodate us, I'm just saying that it's unlikely that most people had 22% in mind when doing their math.