Unit 3A Retake Standard

Unit 3A Retake Standard

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The Percent Proportion

Pre-Algebra

Solving Proportions

• VA SOL 8.4 - The student will solve practical problems involving consumer applications.

• After this lesson, you will be able to solve proportions by using cross-products.

Percent Equation

part = percent x whole

The equation is

a = 12% x 50

is means =

of means multiplication

what means "use a variable"

​Change it to an equation

What is 12% of 50?

Match

Match the following

• What is 15 % of 30?

• 12 is what percent of 20?

• What is 23% of 80?

• What is 42% of 25?

• 15 is what percent of 23?

p = 15% x 30

12 = r x 20

t = 23% x 80

d = 42% x 25

15 = s x 23

• p = 15% x 30

• 12 = r x 20

• t = 23% x 80

• d = 42% x 25

• 15 = s x 23

What is 20% of 15

k = .20 x 15

Now use a calculator to solve

k = 3

Change the percent to a decimal

k = 20% x 15

​Write the equation

Multiple Choice

Solve.
What is 5% of 60?

• 300

• 3

• .03

• .3

Multiple Choice

Solve.
17 is what percent of 68?

• .25

• 25

• 4

• 40

Multiple Choice

What is 20% of 80?

• 1600

• 16

• 160

• 1.6

Multiple Choice

What is 23% of 65?

• 14.95

• 15.95

• 16

• 13.75

Multiple Choice

Bill is in a class of 15 boys and 35 girls. 40% of the students in the class take the bus to school. How many students do not take the bus to school?

• 15

• 20

• 30

• 35

When calculating percent change

Percent Increase vs Percent Decrease

At noon, a tank contained 10 cm of water. After several hours, it contained 7 cm of water. What is the percent change? Was it increase or decrease?

Craig likes to collect vinyl records. Last year he had 10 records. Now he has 12 records. What is the percent change? Was it increase or decrease?

Multiple Choice

The original quantity is 5 and the new quantity is 3. What is the percent change? Is it an increase or decrease?

• 40% increase

• 40% decrease

• 0.4% increase

• 0.4% decrease

• 0.04% increase

Multiple Choice

The original quantity is 10 and the new quantity is 13. What is the percent change? Is it an increase or decrease?

• 0.3% increase

• 0.3% decrease

• 0.03% increase

• 30% decrease

• 30% increase

Multiple Choice

Carl bought an airline ticket. Two weeks ago, the cost of the flight was $300. Now the cost is $375. What is the percent increase?

• .25%

• 25%

• .40%

• 40%

Multiple Choice

What is the percent of change? 55 mph to 70 mph

• 27% increase

• 27% decrease

• 21% increase

• 21% decrease

Multiple Choice

What is the percent of change? 92 lb to 200 lb

• 54% increase

• 54% decrease

• 117% increase

• 117% decrease

Multiple Choice

What is the percent of change? 5 ft to 5 ½ ft

• 10% increase

• 10% decrease

• 9% increase

• 9% decrease

Multiple Choice

What is the percent of change? 70 mph to 55 mph

• 21% decrease

• 21% increase

• 27% increase

• 27% decrease

Multiple Choice

What is the percen of change? 18.7 kg to 4.5 kg

• 76% increase

• 76% decrease

• 3% increase

• 3% decrease

Multiple Choice

What is the percent of change? 4.72 million to 3.15 million

• 33% increase

• 33% decrease

• 50% increase

• 50% decrease

Tax, Tip, Discount

Multiple Choice

Sales tax is __________ to the price

• subtracted

• added

• multiplied

• divided

Multiple Choice

Find the sales tax only. $199.95 Ipod and 9% tax

ROUND your answer!

• $ 17.99

• $ 217.95

• $18.00

• $17.98

Multiple Choice

Find the sales tax only. $899 TV at Best Buy, 6.5% tax? ROUND your answer!

• $957.43

• $957.44

• $58.44

• $58.43

Multiple Choice

iPhone 7 cost $649.00 and 7% tax rate? What would the TOTAL be?

• $45.43

• $649.07

• $603.57

• $694.43

Multiple Choice

Dana buys a new computer that cost $675. Sales tax is 7%. What is the TOTAL cost?

• $682

• $47.25

• $722.25

• $627.75

Multiple Choice

A McDonald’s McChicken cost $1.49. Tax is 5%. What is the TOTAL cost? round!

• $0.07

• $0.08

• $1.56

• $1.57

Multiple Choice

Tip is a percentage of the cost that is __________ to the total

• Added

• Subtracted

• Multiplied

• Divided

Multiple Choice

Kimberly's family has a dinner bill of $26 and wants to leave a 15% tip for their server. How much TIP are they leaving?

• 29.90

• 39.00

• 4.00

• 3.90

Multiple Choice

Miss Colwell gives you the best Buffalo Wild Wings service you have ever had and you want to leave her a 25% tip. How much of a TIP would you leave her if your meal was $38.47? Round!

• $9.62

• $9.61

• $48.09

• $961.75

Multiple Choice

Eliza bought a meal that cost $12.00. She tipped the waiter 25% of that amount. How much was the tip?

• $ 15.00
• $ 12.25
• $3.00
• $4.00

Multiple Choice

How much would the tip be if you left 18% on a $75.45 steak dinner?

• $ 13.58

• $ 89.03

• $ 61.87

• $135.80

Multiple Choice

You get a new haircut that costs $15. You give a tip of 20%. What is the TOTAL cost?

• $35.00

• $3.00

• $18.00

• $12.00

Multiple Choice

Discount is a percentage of the cost that is __________ from the total

• Added

• Subtracted

• Multiplied

• Divided

Multiple Choice

A new jacket costs $32.70. The discount is 30%. What is the discount only?

• $9.81

• $32.40

• $22.89

• $42.51

Multiple Choice

A PS4 costs $399. There is a 20% discount. What is the discount?

• $379

• $79.80

• $319.20

• $478.80

Multiple Choice

A baseball bat cost $28. There is a 25% discount. How much will you pay after the discount? (subtract!)

• $3.00

• $7.00

• $21.00

• $35.00

​Simple Interest

I = P x R x T

When in real life do we have interest with our money?​

Some text here about the topic of discussion

​Simple Interest

I = P x R x T

I= Interest earned

P= Principal: money borrowed or deposited (Starting amount)

R= Rate: Always in decimal form (7%= .07)

T= Time: Always in years (5 years = 5 or 6 months=0.5 years)​

Multiple Choice

If you borrow money for 8 months, what do you use for your formula?

• 8

• 8/12

• 0.6

• 1.5

Multiple Choice

Carrie invests $430 into a savings account. The account pays 3% simple interest on an annual basis. If she does not add or withdraw money, how much interest will she earn after 18 months?

WHAT EQUATIONS WORKS FOR THIS PROBLEM?

• I= 430 X 3 X 18

• I = 430 X .03 X 18

• I = 430 X .3 X 1.5

• I = 430 X .03 X 1.5