CHAPTER 6: PERCENTS

PERCENT PROPORTIONNOTES 73-74

100

What is 50% of 18?

9

200

What is 25% of 44?

11

300

What is 81% of 134?

108.54

400

11.18 is what percent of 86?

13%

500

22 is what percent of 110?

20%

600

9 is 40% of what number?

22.5

700

If 28 of the 50 soup cans on a shelf are chicken noodle soup, what percent of the cans are chicken noodle soup?

56%

800

Of the students in a classroom, 60% are boys. If there are 20 students, how many are boys? 

12

PERCENT ERRORNOTES 79-80

100

Actual time: 2 minutes

Estimated time: 1 minute

What is the percent error?

(2-1) / 2 =

50%

200

Actual mass: 15 grams

Estimated mass: 20 grams

What is the percent error?

(15-20) / 15

33.3%

300

Actual flowers: 16 

Estimated flowers: 20

What is the percent error?

(16-20) / 16 = 

25%

400

Actual amount: 32.4

Estimated amount: 42.4

What is the percent error?

(32.4 - 42.4) / 32.4 =

 30.8% or 31%

500

Actual price: $12.34 

Estimated flowers: $10.00

What is the percent error?

(12.34 - 10.00) / 12. 34 = 

18.9% or 19%

600

Actual volume: 40,000 cups

Estimated volume: 60,000 cups

What is the percent error?

(40,000 - 60,000) / 40,000 = 

50%

700

Actual volume: 13,644 cups

Estimated volume: 25,000 cups

What is the percent error?

(13,644 - 25,000) / 13,644 =

83.2% or 83%

800

Mrs. Hamilton is SUPPOSED to water her plant 10.5 ounces of water each day. She ACCIDENTALLY watered it with 12 ounces. What was her error in percent?

(10.5 - 12) / 10.5 = 

14.2% or 14%

DISCOUNTNOTES 81-82

100

Price: $10

Discount: 50%

What is the price after the discount is applied?

$5

200

Price: $16

Discount: 25%

What is the price after the discount is applied?

$12

300

Price: $98

Discount: 70%

What is the price after the discount is applied?

$29.40

400

Price: $210

Discount: 20%

What is the price after the discount is applied?

$168

500

Price: $4

Discount: 35%

What is the price after the discount is applied?

$2.60

600

Price: $200

Discount: 55%

What is the price after the discount is applied?

$90

700

Price: $900

Discount: 70%

What is the price after the discount is applied?

$270

800

The original price of an iPad Pro is $875 but is on sale for 35% off. What is the price of the iPad Pro before tax?

$568.75

MARKUPNOTES 81-82

100

Price: $10

Markup: 50%

What is the price after the markup is applied?

$15

200

Price: $16

Markup: 25%

What is the price after the markup is applied?

$20

300

Price: $98

Markup: 70%

What is the price after the markup is applied?

$166.60

400

Price: $210

Markup: 20%

What is the price after the markup is applied?

$252

500

Price: $4

Markup: 35%

What is the price after the markup is applied?

$5.40

600

Price: $200

Markup: 55%

What is the price after the markup is applied?

$310

700

Price: $900

Markup: 70%

What is the price after the markup is applied?

$1,530

800

The price to create an Tempurpedic mattress is $124 but will have an 80% markup applied. What number will you see on the price tag in the store?

$223.20

INTERESTNOTES 83-84

100

SIMPLE INTEREST: How much interest will accrue in this account?

$500 at 5% after 10 years

$250

200

SIMPLE INTEREST: How much interest will accrue in this account?

$2,500 at 3% after 16 years

$1,200

300

SIMPLE INTEREST: How much interest will accrue in this account?

$57,000 at 9% after 12 months

$5,130

400

SIMPLE INTEREST: How much interest will accrue in this account?

$100,000 at 1% after 365 days

$1,000

500

SIMPLE INTEREST: How much interest will accrue in this account?

$90 at 8% after 75 years

$540

600

SIMPLE INTEREST: How much interest will accrue in this account?

$1,999,999 at 2% after 10 years

$399,999.80

700

COMPOUND INTEREST: What is the final balance in this account after the 2 years (compounded annually)?

$20,000 at 5% after 2 years

$22,050

800

COMPOUND INTEREST: What is the final balance in this account after the 2 years (compounded annually)?

$45,000 at 7% after 2 years

$51,520.50