What is an 18% tip on a $75 meal?

The way you would calculate this would be:

Multiply 75 by 1.18 (this gives you the initial amount of $75 plus the 18% tip all in one step) This gives you the total: $88.50

If you just want the tip amount:

Multiply 75 by. 18 (this way the 75 is not included in your final number) This gives you: $13.50