1. Sales Tax, Tip and Commission
12/9/14 – 12/10/14

2. Review of Basic Percent Problems
Method
Set Up
Proportion
Percent = 𝑁𝑢𝑚𝑏𝑒𝑟 ℎ𝑢𝑛𝑑𝑟𝑒𝑑 = 𝑛𝑢𝑚𝑏𝑒𝑟 100
𝒏𝒖𝒎𝒃𝒆𝒓 𝟏𝟎𝟎 = 𝒑𝒂𝒓𝒕 𝒘𝒉𝒐𝒍𝒆
Percent Equation (missing the PART)
Percent (as a decimal) = 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒
Percent (as a decimal) = 𝑛 𝑤ℎ𝑜𝑙𝑒
Percent Equation (missing the WHOLE)
Percent (as a decimal)× whole = part
Percent (as a decimal) × 𝑛 = part
Percent Equation (missing the PERCENT)
Percent (as a decimal) × whole = part
𝑛 × whole = part

3. Vocabulary
Tip: an optional payment to someone who provides good service. This is in addition to the cost of the bill.
Sales Tax: the amount added to the cost of an item. It is usually a percent of the purchase price.
Commission: a paid fee for services and is usually a percent of the total cost.
Discount: an amount that is subtracted from the regular price of an item.
Percent Equations are used to solve these types of problems.

4. Example:
The price of a office chair was $ The tax rate was 7%. A. What was the tax on the office chair? B. What was the total price of the office chair including tax?

5. Example:
Find the total price of a $50.60 item plus 6.5% sales tax. There are two methods to solving.