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To solve the problem of finding the total cost of Shelley's breakfast, including the 18% tip, let's follow these steps:

1. **Determine the tip amount**:
   The tip is 18% of Shelley's bill, which was $28.40. 
   We calculate the tip by multiplying the bill by 18%:
   \[
   \text{Tip} = 28.40 \times 0.18 = 5.112
   \]

2. **Calculate the total cost**:
   To find the total cost, we add the tip to the original bill:
   \[
   \text{Total Cost} = 28.40 + 5.112 = 33.512
   \]

3. **Round to the nearest cent**:
   The total cost rounded to the nearest cent is **$33.51**.

So, Shelley's total cost, including the tip, is **$33.51**.

Do you want more details, or have any questions?

Here are 5 related questions you might find useful:
1. How would the total change if the tip were 20% instead of 18%?
2. How would you calculate the total if there was an additional sales tax?
3. What is the formula for calculating percentages in real-life situations?
4. How would the tip calculation change if Shelley used a different percentage?
5. How can you use this method to find discounts on purchases?

**Tip:** When calculating percentages, converting them to decimals (by dividing by 100) helps simplify the multiplication.

Shelley's bill for breakfast at a restaurant was $28.40. She left an 18% tip. What was the total cost of her breakfast, including tip? Round your answer to the nearest cent.

Learn how to calculate the total cost of a meal, including an 18% tip. The bill for Shelley's breakfast was $28.40, and she left an 18% tip. This problem involves basic percentage and arithmetic calculations, suitable for students in Grades 6-8.

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