2. Main Idea and New Vocabulary Example 1: Find the Total Cost
Example 2: Find the Tip
Example 3: Real-World Example
Lesson Menu

3. Solve problems involving sales tax and tips.
gratuity
Main Idea/Vocabulary

4. Method 1 Add sales tax to the regular price.
Find the Total Cost
SOCCER A limited-edition soccer ball costs $30, and the sales tax is 6%. What is the total cost?
Method 1 Add sales tax to the regular price.
First, find the sales tax.
6% of $30 = 0.06  30 Write 6% as a decimal.
= 1.80 The sales tax is $1.80.
Next, add the sales tax to the regular price.
$ $1.80 = $31.80
Example 1

5. Method 2 Add the percent of tax to 100%.
Find the Total Cost
Method Add the percent of tax to 100%.
100% + 6% = 106% Add the percent of tax to 100%.
The total cost is 106% of the regular price.
106% of $30 = 1.06  $30 Write 106% as a decimal.
= $31.80 Multiply.
Answer: The total cost of the soccer ball is $31.80.
Example 1

6. BOOKS A book cost $22 and the sales tax is 8%. What is the total cost?
Example 1 CYP

7. Method 1 Add the tip to the regular price. First, find the tip.
TIPPING Whitney’s bill at a diner came to $ What would she pay if she included a 20% tip?
Method Add the tip to the regular price.
First, find the tip.
20% of $26.00 = 0.20  26 Write 20% as a decimal.
= 5.20 The tip is $5.20.
Next, add the tip to the regular price.
$ $5.20 = $31.20
Example 2

8. Method 2 Add the percent of tip to 100%.
Find the Tip
Method Add the percent of tip to 100%.
100% + 20% = 120% Add the percent of tip to 100%.
The total cost is 120% of the regular price.
120% of $26 = 1.20  $26 Write 120% as a decimal.
= $31.20 Multiply.
Answer: The total cost of the bill with tip is $31.20.
Example 2

9. TIPPING Dave’s lunch bill came to $11. 00
TIPPING Dave’s lunch bill came to $ What would he pay if he included a 15% tip?
A. $11.15
B. $12.65
C. $16.65
D. $25.00
Example 2 CYP

10. 28.25% of $18 = 0.2825  18 Write 28.25% as a decimal.
MANICURE A manicure costs $18. The sales tax is 8.25%. You want to tip 20%. Is $22 sufficient to cover the manicure, tax, and tip?
Sales tax is 8.25% and the tip is 20%, so together they will be 28.25%.
28.25% of $18 =  18 Write 28.25% as a decimal.
= Multiply.
$18 + $5.09 = $ Add.
Answer: No, $22 is not sufficient to cover the manicure with tax and tip.
Example 3

11. A. Yes, the massage with tax and tip is $67.10, so $68 is sufficient.
MASSAGE A massage costs $55. The sales tax is 7%. You want to tip 15%. Is $68 sufficient to cover the manicure, tax, and tip?
A. Yes, the massage with tax and tip is $67.10, so $68 is sufficient.
B. No, the massage with tax and tip is more than $68.
Example 3 CYP