2. Main Idea and New Vocabulary Example 1: Real-World Example
Example 2: Find the Sale Price
Example 3: Find the Original Price
Lesson Menu

3. Solve problems involving discount.
Main Idea/Vocabulary

4. Method 1 Subtract the discount from the regular price.
GOLF A set of golf balls sells for $20. This week it is on sale for 30% off. What is the sale price of the set?
Method 1 Subtract the discount from the regular price.
First, find the amount of the discount.
30% of $20 = 0.30  $ Write 30% as a decimal.
= $ The discount is $6.00.
Next, subtract the discount from the regular price.
$20.00 – $6.00 = $14.00
Example 1

5. Method 2 Subtract the percent of discount from 100%.
100% – 30% = 70% Subtract the discount from 100%.
The total cost is 70% of the regular price.
70% of $20 = 0.70  $20 Write 70% as a decimal.
= $14.00 Multiply.
Answer: So, the sale price of the set of golf balls is $14.00.
Example 1

6. HATS A baseball cap sells for $22. This week it is on sale for 40% off
HATS A baseball cap sells for $22. This week it is on sale for 40% off. What is the sale price of the cap?
A. $18.00
B. $13.20
C. $8.80
D. $4.00
Example 1 CYP

7. Step 1 Find the amount of the discount.
Find the Sale Price
PARTY SUPPLIES Sandra is buying decorations for a party. She wants to buy a set of balloons. The original cost of the balloons is $39, but the store is offering a 25% discount. What is the sale price of the balloons including 5.75% tax?
Step 1 Find the amount of the discount.
25% of $39 = 0.25 ● $39 Write 25% as a decimal.
= $9.75 The discount is $9.75.
Step 2 Subtract the discount from the regular price.
$39 – $9.75 = $29.25
Example 2

8. Step 3 The percent of tax is applied after the discount is taken.
Find the Sale Price
Step 3 The percent of tax is applied after the discount is taken.
5.75% of $29.25 = ● 29.25
Write 5.75% as a decimal.
= 1.68
The tax is $1.68.
Add the tax to the sale price of the balloons.
$ $1.68 = $30.93.
Answer: The sale price of the balloons including tax is $30.93.
Example 2

9. SHOES Jesse is buying a pair of running shoes
SHOES Jesse is buying a pair of running shoes. The original cost of the shoes is $75, but the store is offering a 35% discount. What is the sale price of the tennis shoes including the 6% sales tax?
A. $70.50
B. $51.68
C. $48.75
D. $21.00
Example 2 CYP

10. Find the Original Price
CELL PHONE Rosa buys a cell phone that is on sale for 60% off. If the sale price is $79.98, what is the original price?
The sale price is 100% – 60% or 40% of the original price.
Example 3

11. Find the Original Price
$79.98 = 0.4p Write the equation.
Divide each side by 0.4.
$ = p
Answer: The original price is $
Example 3

12. SHIRTS Malena buys a shirt that is on sale for 50% off
SHIRTS Malena buys a shirt that is on sale for 50% off. If the sale price is $21.99, what is the original price?
A. $71.99
B. $43.98
C. $32.99
D. $26.99
Example 3 CYP