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To calculate the tip for a bill of $40 with an 18% tip:

1. First, convert the percentage to a decimal by dividing by 100:  
   \[
   18\% = \frac{18}{100} = 0.18
   \]

2. Multiply the bill amount by the tip percentage:  
   \[
   40 \times 0.18 = 7.20
   \]

So, the tip would be **$7.20**.

Do you need further details or have any questions?

Here are 5 related questions to further explore this topic:
1. What is the total cost of the meal including the tip?
2. How would the tip change if it was 20% instead of 18%?
3. What tip would you leave on a $50 bill with a 15% tip rate?
4. How much would a 25% tip on a $60 bill be?
5. How do you calculate a 10% tip on a $100 bill?

**Tip**: You can easily estimate a tip by first calculating 10% and then adjusting up or down. For example, 18% can be thought of as 10% plus 8%.

At a restaurant, the bill comes to $40. You decide to leave a 18% tip. How much did you leave for the tip?

Learn how to calculate an 18% tip on a $40 bill with a simple formula. This problem teaches basic percentage concepts suitable for students in Grades 4-6.

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