Main Idea and New Vocabulary Example 1: Real-World Example

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

Solve problems involving discount. Main Idea/Vocabulary

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  $20 Write 30% as a decimal. = $6.00 The discount is $6.00. Next, subtract the discount from the regular price. $20.00 – $6.00 = $14.00 Example 1

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

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

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

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 = 0.0575 ● 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. $29.25 + $1.68 = $30.93. Answer: The sale price of the balloons including tax is $30.93. Example 2

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

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

Find the Original Price $79.98 = 0.4p Write the equation. Divide each side by 0.4. $199.95 = p Answer: The original price is $199.95. Example 3

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