To calculate the tip, you can multiply the total bill by the tip percentage.
The total bill is $92.75 and the tip percentage is 20%, which can be expressed as 0.20.
So, the tip amount is:
\[ \text{Tip} = \text{Total Bill} \times \text{Tip Percentage} = 92.75 \times 0.20 = 18.55 \]
Thus, the tip amount is $18.55.