Four friends go out to dinner and end up with a bill of $107.02 before tip and sales tax has been added. If the city sales tax is 8.7% and they would like to leave a tip of 15% on the original amount before the sales tax is added, then what is the total cost of the meal? Round your answer to two decimal places.

To find the total cost of the meal, including sales tax and tip, we need to follow these steps:

### 1. **Calculate the sales tax:**
The city sales tax is 8.7%, so we calculate the sales tax based on the original amount of $107.02.

\[
\text{Sales Tax} = 107.02 \times \frac{8.7}{100} = 107.02 \times 0.087 = 9.3107
\]

Rounding to two decimal places:

\[
\text{Sales Tax} \approx 9.31
\]

### 2. **Calculate the tip:**
The tip is 15% of the original amount before sales tax.

\[
\text{Tip} = 107.02 \times \frac{15}{100} = 107.02 \times 0.15 = 16.053
\]

Rounding to two decimal places:

\[
\text{Tip} \approx 16.05
\]

### 3. **Find the total cost:**
Now, sum the original amount, the sales tax, and the tip to find the total cost:

\[
\text{Total Cost} = 107.02 + 9.31 + 16.05 = 132.38
\]

Thus, the total cost of the meal is **$132.38**.

Do you want further details or have any questions?

Here are 5 related questions:
1. How would the total change if the tip was based on the total amount including tax?
2. What would the total cost be if the sales tax was 10% instead of 8.7%?
3. If they decided to split the total cost equally, how much would each person pay?
4. How would rounding affect the final total if tax and tip were not rounded?
5. What is the percentage increase of the total cost from the original amount?

**Tip:** When calculating sales tax or tips, always use the original amount before tax for accurate results.

Learn how to calculate the total cost of a meal including an 8.7% sales tax and a 15% tip on a $107.02 bill. This step-by-step guide covers key math concepts like sales tax and tip calculation, suitable for students in Grades 6-8.

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