Percent Proportion: Discounts

​Percent Proportion: Discounts

​Standard NC.7.RP.3

Use scale factors and unit rates in proportional relationships to solve ratio and percent problems.

​Learning Goals

​⋅ I can define discount rate

​⋅ I can write a proportion to calculate a discount

​⋅I can calculate a price after discount (sale price).

Multiple Choice

Change the following percent to a decimal: 40%

• .04

• .40

• 4.0

• 40

Multiple Choice

What is 116% of 60

• 9.6

• 64

• 69.6

• 70

​Think... Pair... Share

​$160

​$40 off or 40% off

Which is the better deal or are they both the same?​

​Discount Vocabulary

Some text here about the topic of discussion

• A discount is the amount of money taken off the price of an item/service.

• A discount rate is a percentage of the cost that you do not pay for an item/service.

• A sale price is the cost of an item/service after the discount has been applied.

Open Ended

What is the difference between a discount and the sale price

​We can write proportions that can help us calculate the amount of discounts after discount rates are applied.

​

​X

​The Percent Proportion

​Example 1

​How much is the discount on an item that is originally priced at $20 and is being sold for 50% off?

​How much is the item being sold for?

​Example 2

​Sheri signed up for Best Buy card when she purchased a TV that was priced at $279.99. Because she applied for the credit card, she was give a 20% discount. How much was deducted from the price of the TV?

​How much will Sheri pay for the TV?

Draw

James is going to purchase a baseball bat that has an original price of $60.00. When he gets to the cash register, he receives a 15% discount. How much is the discount that James receives on the bat? Draw the percent proportion

Multiple Choice

James is going to purchase a baseball bat that has an original price of $60.00. When he gets to the cash register, he receives a 15% discount. How much is the discount that James receives on the bat?

• $15

• $51

• $9

• $6

Multiple Choice

Sarah is buying a new sweatshirt for $40 and it is on sale for 20% off. How much will Sarah pay for the sweatshirt?

• $8

• $32

• $35

• $48

Multiple Choice

Which proportion matches the following:

What is 90% of 250?

• $$\frac{90}{250}=\frac{x}{100}$$

• $$\frac{250}{x}=\frac{90}{100}$$

• $$\frac{x}{250}=\frac{90}{100}$$

Multiple Choice

You are shopping for a new shirt, and you have narrowed your decision down to two. Both shirts are $35, and both are on sale. Shirt A is 25% off. Shirt B is $10 off. Which shirt is the better deal?

• Shirt A
• Shirt B
• The discount is the same.

Multiple Choice

Olivia wants to buy a sticker set on Amazon for $8. They are on sale for 10% off. How much is the discount?

• $7.20

• $7.00

• $1.00

• $0.80

Multiple Choice

When you have a discount, do you add or subtract from the total?

• Subtract
• Add

Multiple Choice

When you have tip, do you add or subtract it from the total?

• Add
• Subtract

Multiple Choice

When you have tax, do you add or subtract it from the total?

• Add
• Subtract

Open Ended

Exit Ticket:

$40 off or 40% off

Which is the better deal or are they both the same?​