Final answer:
A common tip percentage in the United States is around 15%. A 20% tip on a $30.00 bill would be $6.00, making the total amount paid $36.00. The tip is calculated by multiplying the bill amount by the tip percentage in decimal form.
Step-by-step explanation:
The question is asking about a common tip percentage that people leave after receiving a service. In the United States, a common tip percentage is typically around 15%. This is generally regarded as a standard amount to tip in many service industries such as restaurants, with higher percentages (20-25%) for exceptional service and lower percentages (10%) for less satisfactory service. It is less common for people to tip at extreme percentages like 5%, 30%, or 50% for everyday service instances.
To calculate the total amount of a bill with a tip, you would first determine the tip amount by multiplying the bill amount by the tip percentage in decimal form.
For example, on a $30.00 bill with a 20% tip, the tip amount would be $30 x 0.20 = $6.00. So, the total amount paid would be the original bill plus the tip, in this case, $30 + $6 = $36.00.