Rate of change and Percents

What is 42% of 65?

• 23.7
• 25.3
• 27.3

What is 30% of 50? First, write an equation, and then solve. 

• x = (.3)(50) ,    x =20
• 50 = (.3)(x),     x=15
• x = (.3)(50) ,    x=15
• 50 = (.3)(x),     x=20

Sixty percent of the students in the band play woodwind instruments. 45 students play woodwind instruments. How many students are in the band?

• 27

• 113

• 75

• 60

Tickets to Disney World are $100. The price is going to increase on January 1. What is the percent of change if the cost increases to a $120?

• 25%
• 18%
• 20%
• 50%

You estimate that you sent 135 texts last week, but when you get the bill it was actually 108. What was your percent error?

• 20%

• 25%

• 80

• 125%

If lunch costs $30, and you want to leave 20% as a tip, how much would you tip?

• $40

• $36

• $6

• $10

According to a survey, 125 out of 500 people do not have internet. What percent of people surveyed do not have internet?

• 12.5%

• 25%

• 37.5%

• 75%

Find the percent of change from 10 inches to 14 inches.

Find the percent of change from 48 to 36.

In a classroom of 30 kids there are 18 girls and 12 boys. What is the ratio of girls to boys?

• 3:2

• 9:15

• 2:3

• 6:15