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Applications of Percents6-6
Warm UpWarm Up
Lesson PresentationLesson Presentation
Problem of the DayProblem of the Day
Lesson QuizzesLesson Quizzes
Applications of Percents6-6
Warm UpEstimate.
1. 20% of 602
2. 133 out of 264
3. 151% of 78
4. 0.28 out of 0.95
120
50%
120
30%
Possible answers:
Applications of Percents6-6
Problem of the Day
A clothing outlet has a storewide clearance of 10% off all items. In addition, there is a “buy two, get one free” sale on a set of shirts of equal price. What is the total percent price reduction if you buy 3 shirts?
40%
Applications of Percents6-6
MA.8.A.6.4 Perform operations on real numbers (including…percents…) using multi-step and real world problems.
Sunshine State Standards
Applications of Percents6-6
Salespeople often work for commission. A commission is a fee paid to a person who makes a sale. It is usually a percent of the selling price. This percent is called the commission rate.
Often salespeople are paid a commission plus a regular salary. The total pay is a percent of the sales they make plus a salary.
commission ratecommission rate salessales = commissioncommission
Applications of Percents6-6
A real-estate agent is paid a monthly salary of $900 plus commission. Last month he sold one condominium for $65,000, earning a 4% commission on the sale. How much was his commission? What was his total pay last month?
Additional Example 1: Multiplying by Percents to Find Commission Amounts
First find his commission.
4% $65,000 = c commission rate sales = commission
Applications of Percents6-6
0.04 65,000 = c Change the percent to a decimal.
Additional Example 1 Continued
2600 = c Solve for c.
He earned a commission of $2600 on the sale.
Now find his total pay for last month.
$2600 + $900 = $3500 commission + salary = total pay.
His total pay for last month was $3500.
Applications of Percents6-6
A car sales agent is paid a monthly salary of $700 plus commission. Last month she sold one sports car for $50,000, earning a 5% commission on the sale. How much was her commission? What was her total pay last month?
Check It Out: Example 1
Commission = 5% of $50,000 = 0.05 • 50,000
total pay = $700 + $2500 = $3200
= $2500
Applications of Percents6-6
Sales tax is the tax on the sale of an item or service. It is a percent of the purchase price and is collected by the seller.
Applications of Percents6-6
If the sales tax rate is 6.75%, how much tax would Adrian pay if he bought two CDs at $16.99 each and one DVD for $36.29?
Additional Example 2: Multiplying by Percents to Find Sales Tax Amounts
CD: 2 at $16.99 $33.98
DVD: 1 at $36.29 $36.29
$70.27 Total Price
0.0675 70.27 = 4.743225 Write the tax rate as a decimal and multiply by the total price.
Adrian would pay $4.74 in sales tax.
Applications of Percents6-6
Check It Out: Example 2
Amy rents a hotel room for $45 per night. She rents for two nights and pays a sales tax of 13%. How much tax did she pay?
2 nights at $45 = 2 45 = $90
0.13 90 = 11.70
Amy would pay $11.70 in sales tax.
Applications of Percents6-6
Anna earns $1500 monthly. Of that, $114.75 is withheld for Social Security and Medicare. What percent of Anna’s earnings are withheld for Social Security and Medicare?
Additional Example 3: Using Proportions to Find the Percent of Earnings
Think: What percent of $1500 is $114.75?
Set up a proportion.114.75 1500
n100
=
n 1500 = 100 114.75 Find the cross products.
Applications of Percents6-6
Additional Example 3 Continued
n = 7.65
7.65% of Anna’s earnings is withheld for Social Security and Medicare.
11,475 1500
n =
1500n = 11,475 Divide both sides by 1500.
Simplify.
Applications of Percents6-6
Bill earns $2500 monthly. Of that, $500 is withheld for income tax. What percent of Bill’s earnings are withheld for income tax?
Check It Out: Example 3
500 2500
n100
=
1 5
n100
=
n 5 = 10 1 5n = 100
Applications of Percents6-6
Check It Out: Example 3 Continued
= 20
20% of Bill’s earnings are withheld for income tax.
100 5
n =
Applications of Percents6-6
A furniture sales associate earned $960 in commission in May. If his commission is 12% of sales, how much were his sales in May?
Additional Example 4: Dividing by Percents to Find Total Sales
Think: $960 is 12% of what number?
Let s = total sales
960 = 0.12 s Set up an equation.
9600.12
= s Divide each side by 0.12.
8000 = s
The associate’s sales in May were $8000.
Simplify.
Applications of Percents6-6
A sales associate earned $770 in commission in May. If her commission is 7% of sales, how much were her sales in May?
Check It Out: Example 4
770 = 0.07 s
7700.07
= s
11,000 = s
She made sales of $11,000 in May.
Applications of Percents6-6
Standard Lesson Quiz
Lesson Quizzes
Lesson Quiz for Student Response Systems
Applications of Percents6-6
Lesson Quiz: Part I
1. Every month, Gillian makes $1600 plus an 8.9% commission on sales. If her sales last month totaled $18,400, what was her total pay?
2. The sales tax is 5.75%, and the shirt costs $20. What is the total cost of the shirt?
3. Sheridan has a yearly income of $39,650, and he is advised to invest $4500 every year. What percent of his income should he invest, to the nearest tenth of a percent?
$21.15
$3237.60
11.3%
Applications of Percents6-6
Lesson Quiz: Part II
4. If you earn a 4% commission, how much would your total sales have to be to make a commission of $115? $2875
Applications of Percents6-6
1. Vito works at a supermarket. He earns a weekly salary of $500 plus 5% commission on sales. His sales last week totaled $3600. What was his total pay last week?
A. $525
B. $680
C. $725
D. $880
Lesson Quiz for Student Response Systems
Applications of Percents6-6
2. Arnold bought an MP3 player. If the sales tax is 8%, and the MP3 player costs $74, what is the total cost of the MP3 player?
A. $86.25
B. $82.75
C. $79.92
D. $78.75
Lesson Quiz for Student Response Systems
Applications of Percents6-6
3. Marcus earns $30,000 yearly. Of that, he spends $3250 on clothes every year. What percent of his earnings are spent on clothes to the nearest tenth of a percent?
A. 5.7%
B. 7.4%
C. 9.1%
D. 10.8%
Lesson Quiz for Student Response Systems
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