Question

Joseph's lunch at a restaurant costs $13.00, without tax. He leaves the waiter a tip of 17% of the cost of the lunch, without tax. What is the total cost of the lunch, including the tip, without tax?

Answer 1

To calculate the total cost of Joseph's lunch including the tip, we start with the cost of the lunch and then calculate the tip based on that cost.

1. **Cost of the lunch**: $13.00
2. **Tip percentage**: 17%

We first need to calculate the tip:

\[
\text{Tip} = \text{Cost of lunch} \times \frac{\text{Tip percentage}}{100}
\]

Substituting in the known values:

\[
\text{Tip} = 13.00 \times \frac{17}{100} = 13.00 \times 0.17 = 2.21
\]

Now, we add the tip to the cost of the lunch to find the total cost:

\[
\text{Total cost} = \text{Cost of lunch} + \text{Tip} = 13.00 + 2.21 = 15.21
\]

Thus, the total cost of the lunch, including the tip, is:

\[
\boxed{15.21}
\]