Proportional Relationship and Percentages

Grace is baking a cake. The recipe calls for 2 cups of flour and 3 cups of sugar. If 'f' represents the amount of flour and 's' represents the amount of sugar, what equation represents the relationship between the flour and sugar Grace uses?

• f = 1.5s

• f = 2/3s

• f = 2s

• f = 3s

David had 80 apples. He gave some to Grace and Aria, and now he has 60 apples. What is the percent change in the number of apples David has?

• 25%

• 20%

• 30%

• 15%

A store is offering a 20% discount on a shirt that originally costs $50. How much will the shirt cost after the discount?

• $40

• $30

• $35

• $45

A restaurant bill comes to $80. If you want to leave a 15% tip, how much should the tip be?

• $12

• $10

• $15

• $20

A laptop costs $1000 and a 7% sales tax is applied. How much is the total cost of the laptop including tax?

• $1070

• $1007

• $1100

• $1170

What is the formula for calculating percent change?

• New Value + Old Value / Old Value

• New Value - Old Value / New Value

• New Value * Old Value / 100

• ((New Value - Old Value) / Old Value) * 100

• y = 1/5x

• y = 5x

• y = 1/2x

Write the equation of the proportional relationship using the format y = kx.

What is the constant of proportionality? Use the format k = 2.

Write the equation of the graph. Use the format y = kx.