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![Page 1: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/1.jpg)
6-5 Solving Percent Problems
Warm UpWarm Up
Lesson PresentationLesson Presentation
Problem of the DayProblem of the Day
Lesson QuizzesLesson Quizzes
![Page 2: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/2.jpg)
6-5 Solving Percent Problems
Warm UpSolve.
1. 4x = 90
2. 8x = 96
3. 12x = 180
4. 26x = 182
22.5
12
157
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6-5 Solving Percent Problems
Problem of the Day
Rearrange the digits in . What
fraction of the possible arrangements are true proportions?
26
= 13
13
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6-5 Solving Percent Problems
MA.7.A.1.2 Solve percent problems, including problems involving discounts…[and] taxes…
Sunshine State Standards
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6-5 Solving Percent Problems
Sloths may seem lazy, but their extremely slow movement helps to make them almost invisible to predators. Sloths sleep an average of 16.5 hours a day. To find out what percent of a 24-hour day 16.5 hours is, you can use a proportion or an equation.
![Page 6: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/6.jpg)
6-5 Solving Percent Problems
Proportion Method Equation Method
n100
= 16.524
PartWhole
PartWhole
What percent of 24 is 16.5?
n · 24 = 100 · 16.5
24n = 1,650
n = 68.75
n · 24 = 16.5
n = 0.6875
n = 68.75%
Sloths spend about 69% of the day sleeping!
![Page 7: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/7.jpg)
6-5 Solving Percent Problems
Solve.
Additional Example 1A: Using Proportions to Solve Problems with Percents
What percent of 40 is 25?n
100= 25
40
n · 40 = 100 · 25
40n = 2,500
40n40
= 2,500 40
n = 62.5
25 is 62.5% of 40.
Write a proportion.
Set the cross products equal.
Multiply.
Divide each side by 40 to isolatethe variable.
![Page 8: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/8.jpg)
6-5 Solving Percent Problems
Solve.
Additional Example 1B: Using Proportions to Solve Problems with Percents
15 is 25% of what number?
25100
= 15n
n · 25 = 100 · 15
25n = 1,500
25n25
= 1,500 25
n = 60
15 is 25% of 60.
Write a proportion.
Set the cross products equal.
Multiply.
Divide each side by 25 to isolatethe variable.
![Page 9: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/9.jpg)
6-5 Solving Percent Problems
Solve.
Check It Out: Example 1A
What percent of 50 is 10?n
100= 10
50
n · 50 = 100 · 10
50n = 1,000
50n50
= 1,000 50
n = 20
10 is 20% of 50.
Write a proportion.
Set the cross products equal.
Multiply.
Divide each side by 50 to isolatethe variable.
![Page 10: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/10.jpg)
6-5 Solving Percent Problems
Solve.
Check It Out: Example 1B
8 is 40% of what number?
40100
= 8n
n · 40 = 100 · 8
40n = 800
40n40
= 800 40
n = 20
8 is 40% of 20.
Write a proportion.
Set the cross products equal.
Multiply.
Divide each side by 40 to isolatethe variable.
![Page 11: 6-5 Solving Percent Problems Warm Up Warm Up Lesson Presentation Lesson Presentation Problem of the Day Problem of the Day Lesson Quizzes Lesson Quizzes.](https://reader030.fdocuments.in/reader030/viewer/2022033107/56649cc95503460f949917ca/html5/thumbnails/11.jpg)
6-5 Solving Percent Problems
Solve.
Additional Example 2A: Using Equations to Solve Problems with Percents
35 is 28% of what number?
35 = 28% · n
35 = 0.28 · n
350.28
= 0.28 · n0.28
125 = n
35 is 28% of 125.
Write an equation.
Write 28% as a decimal.
Divide each side by 0.28 to isolate the variable.
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6-5 Solving Percent Problems
Solve.
Additional Example 2B: Using Equations to Solve Problems with Percents
What percent of 9 is 18?
18 = n · 9
189
= n · 99
2 = n
200% = n
18 is 200% of 9.
Write an equation.Divide each side by 9 to isolate the variable.Write the decimal as a percent.
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6-5 Solving Percent Problems
Solve.
Check It Out: Example 2A
36 is 24% of what number?
36 = 24% · n
36 = 0.24 · n
150 = n
36 is 24% of 150.
Write an equation.
Write 24% as a decimal.
Divide each side by 0.24 to isolate the variable.
360.24
= 0.24 · n0.24
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6-5 Solving Percent Problems
Solve.
Check It Out: Example 2B
What percent of 6 is 36?
36 = n · 6
366
= n · 66
6 = n
600% = n
36 is 600% of 6.
Write an equation.Divide each side by 6 to isolate the variable.Write the decimal as a percent.
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6-5 Solving Percent Problems
Raoul found a pair of shoes that were marked down to 80% of the original price. He had a coupon that gave him an additional $10 off the shoes. The sales tax rate was 6.5% and Raoul paid $5.46 in sales tax. What was the original price of the pair of shoes?
Additional Example 3: Consumer Application
Write a word sentence.
Work backward. Find the final price of the shoes.
6.5% of price is $5.46.
Write an equation.0.065 x = 5.46
Divide both sides by 0.065.
x = 84The price of the shoes with the coupon was $84.
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6-5 Solving Percent Problems
Additional Example 3 Continued
Find the price of the shoes without the coupon.
84 + 10 = 94The price of the shoes was $94 after it was marked down to 80% of the original price. Find the original price.
Write a word sentence.80% of price is $94.
Write an equation.0.8 x = 94
Divide both sides by 0.8.
x = 117.5
The original price of the shoes was $117.50.
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6-5 Solving Percent Problems
Livy found a comforter marked down to 50% of the original price. She had a coupon that gave her an additional $10 off her purchase. The sales tax rate was 8.25% and Livy paid $6.19 in sales tax. What was the original price of the comforter?
Check It Out: Example 3
Write a word sentence.
Work backward. Find the final price of the comforter.
8.25% of price is $6.19.
Write an equation.0.0825 x = 6.19
Divide both sides by 0.0825.
x = 75.03The price of the comforter with the coupon was $75.03.
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6-5 Solving Percent Problems
Check It Out: Example 3 Continued
Find the price of the comforter without the coupon.
75.03 + 10 = 85.03
The price of the comforter was $85.03 after it was marked down to 50% of the original price. Find the original price.
Write a word sentence.50% of price is $85.03.
Write an equation.0.5 x = 85.03
Divide both sides by 0.5.
x = 170.06
The original price of the comforter was $170.06.
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6-5 Solving Percent Problems
A portable DVD player costs $225 before tax at an appliance warehouse. What is the sales tax rate if the tax is $18?
Additional Example 4: Finding Sales Tax
n100
= 18225
n · 225 = 100 · 18
8% of $225 is $18. The sales tax is 8%.
Write a proportion.
Set the cross products equal.
Multiply.
Restate the question: What percent of $225 is $18?
225n = 1800
225n225
= 1800225
Divide each side by 225.
n = 8
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6-5 Solving Percent Problems
A new flat screen TV costs $800 before tax at an appliance warehouse. What is the sales tax rate if the tax is $56?
Check It Out: Example 4
n100
= 56800
n · 800 = 100 · 56
7% of $800 is $56. The sales tax is 7%.
Write a proportion.
Set the cross products equal.
Multiply.
Restate the question: What percent of $800 is $56?
800n = 5600
800n800
= 5600 800
Divide each side by 800.
n = 7
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6-5 Solving Percent Problems
Standard Lesson Quiz
Lesson Quizzes
Lesson Quiz for Student Response Systems
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6-5 Solving Percent Problems
Lesson QuizSolve.
1. 21 is 42% of what number?
2. What percent of 292 is 73?
3. 112% of what number is 84?
4. What percent of 1,340 is 13.4?
5. An ad features a bicycle on sale for $139. If the total cost of the bike is $147.34, what is the sales tax rate?
25%
50
75
1%
6%
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6-5 Solving Percent Problems
1. Solve. 19 is 38% of what number?
A. 69
B. 50
C. 38
D. 34
Lesson Quiz for Student Response Systems
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6-5 Solving Percent Problems
2. What percent of 170 is 51?
A. 25%
B. 30%
C. 40%
D. 50%
Lesson Quiz for Student Response Systems
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6-5 Solving Percent Problems
3. 128% of what number is 96?
A. 25
B. 50
C. 75
D. 96
Lesson Quiz for Student Response Systems
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6-5 Solving Percent Problems
4. What percent of 1,520 is 15.2?
A. 25%
B. 15%
C. 10%
D. 1%
Lesson Quiz for Student Response Systems
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6-5 Solving Percent Problems
5. A jeweler has a pendant on sale for $150. If the total cost of the pendant is $160.50, what is the sales tax rate?
A. 6%
B. 7%
C. 8%
D. 9%
Lesson Quiz for Student Response Systems