1. Percent Applications
Sales Tax
Tips
Interest

2. is determined by finding a certain percentage of a purchase price
is determined by finding a certain percentage of a purchase price. It is added to your total bill when you make a purchase.
Sales tax

3. Calculating Sales Tax
Figure out your total bill if you buy a CD for $16 with a sale tax of 5%.
Method 2:
Add the percent to 100%:
100% + 5% = 105%
Method 1:
Find the tax and add to price
Convert % to a decimal
5% = .05
Convert % to a decimal
105% = 1.05
Multiply price by the decimal.
$16 x .05 = .80
Multiply price by the decimal.
$16 x 1.05 = $16.80
Add the tax to the price.
$ = $16.80

4. Calculating Sales Tax
Lindsey went to Best Buy and bought a laptop computer. If the laptop Player costs $500 and the sales tax was 6.5%, what was her total bill?
Method 1:
Find the tax and add to price
Method 2:
Add the percent to 100%:
100% + 6.5% = 106.5%
Convert % to a decimal
6.5% = .065
Convert % to a decimal
106.5% = 1.065
Multiply price by the decimal.
$500 x .065 = $32.50
Multiply price by the decimal.
$500 x = $532.50
Add the tax to the price.
$500 + $32.50 = $532.50

5. A is money given to someone to show appreciation for a service.
tip

6. Calculating Tip
Kevin ate lunch with his friends at Chili’s. Their meal cost $ If they tipped their waitress 20%, what was their total bill?
Method 1:
Find the tip and add to price
Method 2:
Add the percent to 100%:
100% + 20% = 120%
Convert % to a decimal
20% = .20
Convert % to a decimal
120% = 1.20
Multiply cost by the decimal.
$24.50 x .20 = $4.90
Multiply price by the decimal.
$24.50 x 1.2 = $29.40
Add the tax to the price.
$ $4.90 = $29.40

7. Calculating Tip
Danielle ate dinner with her family at Ruby Tuesdays. Their bill came to $ If they left a 18% tip, how much was their total bill?
Method 1:
Find the tip and add to price
Method 2:
Add the percent to 100%:
100% + 18% = 118%
Convert % to a decimal
18% = .18
Convert % to a decimal
118% = 1.18
Multiply cost by the decimal.
$37.40 x 0.18 = $6.73
Multiply price by the decimal.
$37.40 x 1.18 = $44.13
Add the tax to the price.
$ $6.73 = $44.13

8. is money paid regularly at a particular rate for the use of money or invested
Interest

9. Calculating Simple Interest
You have a savings account that pays an annual interest rate of 6%. If you deposit $150, how much will you have at the end of the year?
Method 1:
Find the interest & add to deposit
Method 2:
Add the percent to 100%:
100% + 6% = 106%
Convert % to a decimal
6% = 0.06
Convert % to a decimal
106% = 1.06
Multiply deposit by the decimal.
$150 x 0.06 = $9
Multiply price by the decimal.
$150 x 1.06 = $159
Add the tax to the price.
$150 + $9 = $159

10. Calculating Simple Interest
You want to buy a car that costs $20,000. You need to take out a loan and the interest rate is 2.5%. If you are able to repay the loan in one year, how much would you owe?
Method 1:
Find the interest & add to deposit
Method 2:
Add the percent to 100%:
100% + 2.5% = 102.5%
Convert % to a decimal
2.5% = .025
Convert % to a decimal
102.5% = 1.025
Multiply loan by the decimal.
$20,000 x = $500
Multiply price by the decimal.
$20,000 x = $20,500
Add the tax to the price.
$20,000 + $500 = $20,500