How not to look like a tight git

I don't want to look like one of those losers who can't wipe their ares without an iPhone app, but I am, so its hard.

Maths isn't my strong point and the tipping culture in the States (aside form being fundamentally ridiculous - if the tag says $50, why have I just paid $56. I know you want to be able to fluctuate the rate according to the economic status of the country, but, no-one has a clue how much their paying til they get to the checkout?!) was a challenge, especially with all the urban legends of waiters chasing tightwad tourists down the road.

So, my tip-calclator app was spot on. I think 17% may have been a little generous (even though thats what the bloggers said) but 'Mandy' said that I'd 'seen her and her daughter right', so I've done my bit for the American economy. You're welcome.