How much do you tip?

[taylor]

Another thing that puzzles me about tipping. Let's say you order 4 burger meals and cups of water (free) for a party of 4, the bill comes to 40 bucks. You tip your server 20% which is 8 bucks. Later in the week you go to the same restaurant, you order 4 steak dinners and 4 cocktails for a party of 4. This time the bill comes out to 120 bucks. Again you tip the server 20% but this time the tip comes out to $24. Playing devil's advocate, does the server really deserve 3 times more tip just because the patron ordered more expensive items on the menu? Because the work for the server is essentially the same.