Lesson 20 S1 (New Books)

Multiple Choice

Which of the following is NOT typically solved using percent calculations in everyday life?

• Calculating sales tax on a purchase

• Finding the tip at a restaurant

• Measuring the length of a pencil

• Determining the amount of discount during a sale

Multiple Choice

Which of the following statements about percents is true?

• 60% of 40 is 24.

• 40% of 80 is 50.

• 30% of 70 is the same as 3/7 of 70.

• 40% of 70 is the same as 2/5 of 70.

Multiple Choice

Which of the following is the only representation without numbers?

• 25%

• 1/4

• 0.25

• Shaded circle

Multiple Select

Which of the following representations use the digits 2 and 5?

• 25%

• 1/4

• 0.25

• Shaded circle

Fill in the Blanks

Last year, a middle school band had

students.

Open Ended

Last year, a middle school band had 80 students. This year, the band has 120% of that number of students. How many students are in the band this year?

Open Ended

How did you get started finding the number of students?

Fill in the Blanks

120% of 80 is equal to

Multiple Select

Which of the following strategies can be used to find 120% of 80?

• Divide 80 by 2 and add to 80

• Multiply 80 by 1.2

• Subtract 20% of 80 from 80

• Add 20% of 80 to 80

Multiple Choice

Which of the following is the correct formula for calculating simple interest?

• I = Prt

• I = P + rt

• I = P/r + t

• I = Pr/t

Open Ended

Suppose you borrow $300 at a yearly, or annual, simple interest rate of 3.4% for 3 years. What values would you use for P, r, and t?

Multiple Choice

Which formula is used to calculate simple interest?

• I = Prt

• I = P + rt

• I = Pr + t

• I = Pt / r

Multiple Choice

Is putting an item on sale for 25% off an example of a markup or a markdown?

• Markup

• Markdown

• Tax

• Commission

Fill in the Blanks

Suppose you borrow $400 at a yearly simple interest rate of 3% for 3 months. What values would you use for P, r, and t?

Fill in the Blanks

Jason earns a 9% commission on a $1,000 sale. How much is Jason’s commission?

Multiple Choice

Suppose you pay a 7% tax on an item. What percent of the price of the item will you pay in total?

• 100%

• 107%

• 7%

• 93%

Open Ended

Explain how proportional relationships can be used to solve problems involving tax, tip, commission, markup, markdown, discount, and simple interest in real-world situations.

Open Ended

Is it possible for a single price change to be both a markup and a markdown? Explain your thinking.

Multiple Choice

Which of the following best describes the difference between a markup and a markdown?

• A markup is an increase in price, while a markdown is a decrease.

• A markup is a decrease in price, while a markdown is an increase.

• Both markup and markdown are increases in price.

• Both markup and markdown are decreases in price.

Open Ended

Explain why a single price change cannot be both a markup and a markdown.

Multiple Select

Which of the following are correct ways to calculate 125% of 40?

• Multiply 40 by 1.25

• Add 25% of 40 to 40

• Divide 40 by 1.25

• Multiply 40 by 125

Multiple Choice

If last year a rapper performed 40 times and this year performs 125% of that number, how many times does the rapper perform this year?

• 40

• 45

• 50

• 55

Open Ended

Is Isabel correct in saying that 0.02 can be expressed as 20%? Explain why or why not.

Multiple Choice

Starting money = $350.

Interest rate = 2.5%

TIme = 3 years.

How much is the total balance?

• $376.25

• $26.25

• $87.5

• $323.75