Proportionality Lesson with Percents

Multiple Choice

A music store marks up the instruments it sells by 30%. If the store bought a guitar for $45, what will be its store price?

• $58.50

• $59.00

• $60.00

• $61.50

Multiple Choice

A music store marks up the instruments it sells by 30%. If the price tag on a trumpet says $104, how much did the store pay for it?

• 70
• 90
• 100
• 80

Multiple Choice

A music store marks up the instruments it sells by 30%. If the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?

• Yes

• No

Multiple Choice

A family eats at a restaurant. The bill is $42. The family leaves a tip and spends $49.77. How much was the tip in dollars?

• 5.50
• 8.25
• 7.77
• 10.00

Multiple Choice

A family eats at a restaurant. The bill is $42. The family leaves a tip and spends $49.77. How much was the tip as a percentage of the bill?

• 20%
• 15%
• 25%
• 18.5%

Multiple Choice

The price of gold is often reported per ounce. At the end of 2005, this price was $513. At the end of 2015, it was $1,060. By what percentage did the price per ounce of gold increase?

• 106.7%
• 75%
• 120%
• 50%

Multiple Choice

For diagram A, decide if $$y$$ is an increase or a decrease of $$x$$ .

• Increase

• Decrease

Multiple Choice

For Diagram A, what is the percentage change from $$x$$ to $$y$$ ?

• Percentage change from x to y is calculated as ((y - x) / x) * 100.
• Percentage change from y to x is ((x - y) / y) * 100.
• Percentage change is calculated as (x + y) / 2 * 100.
• Percentage change is simply y - x.

Multiple Choice

For diagram B, decide if $$y$$ is an increase or a decrease of $$x$$ .

• Increase

• Decrease

Multiple Choice

For Diagram B, what is the percentage change from $$x$$ to $$y$$ ?

• 75%
• 60%
• 45%
• 30%