Using Proportional Relationships: Percents

A pair of sunglasses is on sale for $17. Last week, the sunglasses were marked at a regular price of $20. What is the percent decrease in the price of the sunglasses?

• 20%

• 17%

• 25%

• 15%

Gigantic Gardens is having a sale on water hoses. Today, a 40-foot water hose is on sale for $5.60. The regular price of the water hose was $16. What is the percent decrease in the price of the 40-foot water hose?

• 35%

• 65%

• 16%

• 60%

Kelvin sells gym equipment to gymnastics training centers. He earns 12% commission on all of his sales. Yesterday, Kelvin sold $5000 worth of gym equipment to a local gymnastics training center. Which of the following equations can be used to find c, the amount of commission Kelvin earned on that sale?

• c = (5000)(0.12)

• c = (5000)(12)

• c = 100(5000) + 12

• c = 2(5000) + 12

Pasha earned 20% commission when she sold a set of dining room furniture. The furniture cost $650. Which of the following equations can be used to find c, the amount of commission Pasha earned for this sale?

• c = 2(650)(0.20)

• c = (650)(20)

• c = 650 + 20

• c = (650)(0.20)

Luxurious Linens is having a towel sale. Today, a set of lavender towels is on sale for $39.90. If the towels are 5% off the regular price, what was the regular price of the set of lavender towels?

• $2.00

• $37.91

• $42.00

• $2.10

The sale price of a set of markers is $2.80. If the markers are 20% off, what was the regular price of the set of markers?

• $3.50

• $2.24

• $0.56

• $3.00

Quincy would like to leave a 15% tip before he leaves a restaurant. If Quincy’s meal cost $9.50, which equation can he use to find t, the total cost of the meal, including the tip?

• t = 9.50 + 0.15

• t = 9.50 + 0.15(9.50)

• t = 9.50 – 0.15(9.50)

• t = 0.15(9.50)

The Harris family enjoyed dinner at The Burger Barn. Mr. Harris plans to leave an 18% tip on the cost of the meal, $26.00. Which equation can he use to find the total cost of the meal, t, including the tip?

• t = (26.00)(0.18)

• t = 26.00 – 0.18(26.00)

• t = 26.00 + 0.18(26.00)

• t = 26.00 + 0.18

A gaming system is regularly priced at $165. It is on sale this week for $132. What is the percent decrease in the price of the gaming system?

• 33%

• 20%

• 80%

• 40%

A dozen cupcakes are regularly priced at $14.50. Each Friday, the store runs a “Thank Goodness It Is Friday Sale” and a dozen cupcakes are $8.70. What is the percent discount during the sale?

• 30%

• 60%

• 66%

• 40%