None of those above statement that I did except saying Zero as a "0" .
But you forgot one main thing, that most likely everyone does, That is saying "Thank you" at the end.

I do go Nepal frequently but one time in 2009, I always take this guy, my high school friend. Ofourse, after staying in states, you do think every waiter or every person doing an ordinary job in Nepal, we try to comapre ourself as we do the same kind here to support while going to school. So, where ever I went, I used to tip a lot even like 500Rs when the bill is just 1500 Rs and even I went couple of times to Casino also. I used to tip every person including the Manager's, the floor girl and the person who cleans the toilet.
At the same trip, I had to apply visa for US and I was at Nabil Bank and I had some issues that I had to give them a copy of my i20 but i left it at home and that section was about to close within 30 mins. They said that they will wait for me if I can bring within 2 hrs. I brought it, we solved and this guy was with me, my friend. After I finsh the task in the bank, My friend told me, "Malai ta kata timile tyo bank ko manche lai ni Tips dinchau hola jasato lagiraheko thiyo".  I laughed at him and I asked him, how do they separate us people coming from States. He told me that our behaviour, the way we speak and the attitude(humble, respect and polite) differenciates us from the others. And moreover, he told me that we have Hands gestures every time we speak.

CHEERS !!! Happy Friday Fellas !!!