# Actually Applicable Application Problems and Brainteasers/Tipping

## Overview

Information about tipping in general is included in the Tip Estimation 1 Problem.

Now that calculators are so easy to carry with you (and in fact included as apps in devices you need for other reasons), many people prefer to calculate tips exactly (then perhaps round afterward).

## General Method

Choose the tip percentage you want to give.

Convert that percentage to a decimal. For example, 20% is 0.2 (if it helps you to write it as 0.20 that's OK too) and 15% is 0.15.

Multiply the bill for the meal by that decimal. The product is how much you should tip. (You can round at this point if you wish.)

## Problems

Calculate the tip on these bills at 15%, 20%, and 25%:

• \$23.47
• \$32.50
• \$19.45

### Extension 1: Planning

If a server needs to earn \$150 in tips and the average bill in a restaurant is \$25, approximately how many tables must he wait on?

### Extension 2: Evaluating Estimates

Compare your exact results from this method with at least two methods for estimating a tip, and use that to help you form an opinion about estimation methods.