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

Fill in the Blank

During a trip to the grocery store, Harry purchased a gallon of milk for $3.79, a loaf of bread for $2.39, and a box of cereal for $4.00. He received a 5% discount off his purchase when he used his loyal customer discount card. How much was the discount? (Only include numbers in your answer. Do not use any symbols) Remember we are talking about money!!!

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?​