1. Topic: Calculating Discounts and Sales Tax
Do now: Quickie Quiz…how much do you know?

2. What is the problem? Discount Alert!! …
While holiday shopping…(we will come back to this later)
Hiking shoes originally $130.00
Discount 31%
Total advertised-$89.99
So what is the problem? How do you know if you are being ripped off?

3. Goal of the lesson…
Demonstrate how to calculate discount and sales tax
Be an informed consumer (one who buys and makes purchases ) so that you know if you have enough money to cover any purchase
Not enough $

4. But don’t forget sales tax  …..
Bigger Picture….
What is a discount? How does it look when I shop?
But don’t forget sales tax  …..

5. Vocabulary
Informed Consumer-any person who buys an item AND has knowledge about the product and mathematically can recognize the advertised sales price
Discount- (more/less money) toward a purchase -pre-tax
Sales Tax-(subtracted/added) to the total purchase price, changes by county and state
Sales Tax Rate- for Suffolk County-8.625%
*Change the percent to a decimal- ____________

6. Practice-Discounts (+ or -)
A shirt costs $42. Discount 10%
Step Change the percent to a decimal
Step 2 Multiply the cost with the sales tax to find the sub total
Step 3 Subtract the cost of the item(s) with the total amount

7. Practice-Sales Tax (+ or -)
You purchased the following items: coat $119, sneaker $79.99, hat $10. Sales tax 4.6%
Step Add the total purchase
Step Change the percent to a decimal
Step 3 Multiply the cost with sales tax to find the sub
total
Step 4 Add the cost of the item(s) with the sales tax
amount to find the total amount

8. jeans $89.99, shirt $29.79, shoes $49. Sales tax 5%
More practice….
jeans $89.99, shirt $29.79, shoes $49. Sales tax 5%
Step Add the total purchase
Step Change the percent to a decimal
Step 3 Multiply the cost by sales tax to find the sub total
Step 4 Add the cost of the item(s) with the sales tax amount
to find the total amount

9. Putting it all together… sales tax and discounts
A phone costs $ It is on sale at 15% off. The sales tax is 7% 100 x .15= =85 85 x .07= = $90.95

10. A big screen tv costs $1100. 00, cables are 29. 99
A big screen tv costs $ , cables are It is on sale at 25% off. The sales tax is 7%.

11. A total outfit consists of: shirt $29. 99, pants $59. 99, socks $2
A total outfit consists of: shirt $29.99, pants $59.99, socks $2.99 and shoes $25. It is all on sale at 15% off. The sales tax is 7%.
=117.97
x .15 = =17.70
=100.27
x .07 =7.0189=7.02
=$124.58

12. Car Shopping
New car price:
Discount: 7%
Sales Tax: %

13. Discount Alert!! … While holiday shopping…
Hiking shoes originally $130.00
Discount 31%
Total advertised-$89.99
So what is the problem?

14. Let’s try some problems…
Discount/Sales Tax with varying tax from NYS county…

15. Remember the steps (notes):
Step 1 Change the percent to a decimal Step 2 Multiply the cost by discount and/or sales tax to find the sub total Step 3 Determine whether to use addition or subtraction…discount (-) and sales tax (+) Step 4 Always ask yourself…Did I complete the multi step problem? Did I do it twice? Now let’s try some problems on your own…

16. Summary
Remember to think about the mathematical steps to calculate the cost of your purchase when dealing with discounts and sales tax
Knowing how to calculate purchases with discounts and sales tax makes you an informed consumer who is less likely to get “ripped” off
If you know how to calculate percentages then you will also be able to apply it to:
-Tips (restaurants)
-Commission (selling items)
-Down Payments (cars, homes)
-Shipping Charges (%)
“Ticket to leave”…post assessment

17. Explain the steps to make a purchase with a discount and sales tax…