Percent of a Number and PI

A circle has a diameter of 7 inches and a circumference of approximately 22 inches. Based on this circle, which ratio is equivalent to the value of 𝜋?

• $\frac{22}{7}$

• $\frac{7}{22}$

• $\frac{22}{3.5}$

• $\frac{3.5}{22}$

A circle has an approximate circumference of 28.3 cm and a radius of 4.5 cm. Based on this circle, which ratio is equivalent to the value of 𝜋?

• $\frac{28.3}{4.5}$

• $\frac{4.5}{28.3}$

• $\frac{28.3}{9}$

• $\frac{9}{28.3}$

A circle has a diameter of 105 mm and a circumference of 329.9 mm. Based on this circle, which ratio is equivalent to the value of 𝜋?

• $\frac{210}{329.9}$

• $\frac{329.9}{210}$

• $\frac{105}{329.9}$

• $\frac{329.9}{105}$

Ronald purchased a brand new phone for $450.00. Since phones are taxable, he had to pay a sales tax of 4.5%. How much sales tax did Ronald pay for the phone?

• $470.25

• $20.25

• $202.50

• $47.50

Michael wants to go to Europe. The airline ticket costs $1540. If the airline tickets are subject to 15.3% travel tax, how much travel tax does Michael need to pay?

• $235.62

• $244.84

• $236.44

• $238.26

Emma earns a 6.5% commission for all the sales she makes in a month. If Emma's total sales were $18400, how much would her commission be?

• $2830

• $283

• $119.60

• $1196

The original price of a TV was $3500. However, Ben was able to purchase the TV at a marked down price of 5% off the original price. How much of a discount did Ben get on the TV?

• $1750

• $175

• $225

• $2250

What is 16% of 40?

• 0.64

• 64

• 6.4

• 0.064

What is 20% of 96?

• 1.92

• 0.192

• 192

• 19.2

What is 30% of 130?

• 39

• 3.9

• 0.39

• 0.039