Final answer:
To find the tip amount, you need to calculate 15% of the bill by multiplying the bill amount by 0.15.
Step-by-step explanation:
To find the tip amount, you need to calculate 15% of the bill. To do this, convert 15% to a decimal by dividing it by 100 (15/100 = 0.15). Then, multiply 0.15 by the bill amount:
Tip amount = 0.15 * $555 = $83.25
Therefore, the tip amount is $83.25.