Final answer:
To find the total bill at a restaurant, add the cost of the meal, the tip (calculated by converting the tip percentage to a decimal), and the sales tax (also converted to a decimal). For example, the Greens' dinner cost $72, with an 18% tip and 6% sales tax, resulted in a total bill of $89.28.
Step-by-step explanation:
Finding Total Bills Involving Tips and Taxes
When calculating the total bill at a restaurant, it is important to add both taxes and tips to the cost of the meal if you are using a credit card. This ensures that servers receive their tips, and it provides a complete picture of the amount paid. Let's walk through a scenario with Mr. and Mrs. Green's family dinner to understand the process.
Calculating the Tip
First, find the amount of the tip. If a restaurant adds an 18% tip automatically, as in the case of Mr. and Mrs. Green's dinner which cost $72, you would calculate the tip by converting the percentage to a decimal and multiplying by the meal cost:
- Tip percentage as a decimal: 18% -> 0.18
- Tip amount: $72 x 0.18 = $12.96
Adding Sales Tax
Next, calculate the sales tax. Assuming the sales tax rate is 6%, the calculation would be:
- Sales tax as a decimal: 6% -> 0.06
- Sales tax amount: $72 x 0.06 = $4.32
Total Bill
Add both the tip amount and the sales tax to the original meal cost to find the total bill:
- Total cost: Meal cost + Tip + Sales Tax
- Total cost: $72 + $12.96 + $4.32 = $89.28
Therefore, the total cost of Mr. and Mrs. Green's dinner, including an 18% tip and 6% sales tax, is $89.28.