Proportions - Tax, Tip, Discount, and %

Solve the following proportion.

 $\frac{12}{15}=\ \frac{x}{45}$  

• x = 3

• x = 30

• x = 36

• x = 10

10% of the students in class are wearing contacts. If there were 20 people in class, how many students were wearing contacts?

• 2

• 10

• 15

• 4

In Mr. Lightyear's 7th grade class there are 6 boys and 9 girls. If there are 150 total students in all of 7th grade, how many total boys are in 7th grade?

• 6

• 9

• 60

• 150

Simba went to the store and spent 15$ if he spent 20% of his allowance, how much was his total allowance?

Which proportion below is the correct set up for the problem above.

• $\frac{x}{15}=\frac{20}{100}$

• $\frac{15}{100}=\frac{x}{20}$

• $\frac{x}{20}=\frac{15}{100}$

• $\frac{20}{100}=\frac{15}{x}$

Lilo and Stitch went to Red Robin for lunch and got a final bill of $52.40. If their tax was 7.5%, what is the total of the tax for their bill?

• $7.50

• $3.93

• $56.33

• $48.47

Ralph and Vanellope are traveling and stopped at a gas station. If they spent $4.29 on chips, $3.14 on drinks and $2.50 on gum. With the tax at 5.5%, what is the total they have to pay with tax?

• $10.48

• $14.92

• $0.55

• $7.43

Olaf, Anna, Elsa, Sven, and Christoph go out to eat at Red Lobster. They leave a tip of $31.08. If they left a 24% tip, what was the price of the bill before the tip?

• $150.00

• $129.50

• $31.08

• $55.08

Jasmine and Ariel order a pizza for $10.99 and leave the delivery guy a 30% tip. How much do they pay for the pizza and the tip?

• $14.29

• $10.99

• $12.99

• $3.30

Jessie and her cowgirl friends bought Bullseye a gift for Christmas. If they spent $329.99 on the item and paid the tax of 12.5%. Which proportion below would let them solve the problem correctly for how much each person must pay?

• $\frac{x}{12.5}=\frac{329.99}{100}$ Then divide by the number of people purchasing the item.

• $\frac{x}{329.99}=\frac{12.5}{x}$ Then divide by the number of people purchasing the item.

• $\frac{x}{100}=\frac{12.5}{239.99}$ Then divide by the number of people purchasing the item.

• $\frac{x}{329.99}=\frac{12.5}{100}$ Then divide by the number of people purchasing the item.

Lightning and Sally are buying a new car. The dealership is offering a discount of 12%. If they want to purchase a car that costs $22,000 after the discount, how much does the car cost after the discount.

• 22,000

• 17,500

• 19,360

• 2,640