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Sebastian wants to leave a 34% tip, and the dinner costs **d** dollars. To find the total cost including the tip, we need to add 34% of **d** to the original cost **d**.

The tip is calculated as:
\[
0.34 \times d
\]
Thus, the total cost (dinner + tip) is:
\[
d + 0.34d = 1.34d
\]

Now let's match this with the given answer options:
- **1.034d** (Incorrect: this implies a 3.4% tip, not 34%)
- **d + 0.34d** (Correct: this represents the dinner plus 34% of the cost)
- **d + 0.34** (Incorrect: this adds a flat $0.34, not 34% of the cost)
- **1 + 0.34** (Incorrect: this isn't relevant to the cost and tip)

So, the correct answer is: **d + 0.34d**.

Would you like further explanation on any part of this? Here are 5 related questions to think about:

1. How would the expression change if the tip percentage was 15% instead of 34%?
2. Can you convert 34% into a fraction, and would the expression change using the fraction form?
3. How can you calculate the tip for a dinner that costs $45?
4. What is the final bill if **d** is $100 with a 34% tip?
5. How does the formula change if taxes are included on top of the tip?

**Tip**: Percentages are often used in pricing problems; converting them into decimals (like 34% = 0.34) makes the calculation straightforward.

Sebastian was out at a restaurant for dinner when the bill came. He wanted to leave a 34% tip. If dinner cost d dollars and cents, which expression represents the cost of dinner plus tip?

Learn how to calculate the total cost of dinner, including a 34% tip. This problem involves key mathematical concepts such as percentages and basic algebra, making it perfect for students in Grades 6-8.

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