Good evening, sir. What can I do for you?
Bourbon, please.
How would you like your Bourbon, straight or on the rock?
With iced water, please.
Here you are, sir. Bourbon with iced water.
Thank you. Now how much do I owe you?
The bourbon is 15 dollars plus 10 % service charge. So the total is 16. 5 dollars.
That is OK. Here is 20 dollars and you can keep the change.