Lesson 21 Practice Quiz A

In January, Jamie pays $2.00 for a tube of toothpaste. When she buys the same brand and size toothpaste in February, she pays $2.25.

The percent of increase in the price of the toothpaste from January to February is _____ rounded to the nearest tenth of a percent.

A company conducts a study of how its number of employees has changed over three years. At the beginning of the three-year period, the company had 240 employees. The table shows the percent change in the number of employees during each year that followed.

Determine if the statement below about the number of employees is true or false:

There were 216 employees at the company at the end of Year 1.

• True
• False

A company conducts a study of how its number of employees has changed over three years. At the beginning of the three-year period, the company had 240 employees. The table shows the percent change in the number of employees during each year that followed.

Determine if the statement below about the number of employees is true or false:

The company had 270 employees at the end of Year 2.

• True
• False

A company conducts a study of how its number of employees has changed over three years. At the beginning of the three-year period, the company had 240 employees. The table shows the percent change in the number of employees during each year that followed.

Determine if the statement below about the number of employees is true or false:

There was a 5% decrease in the number of employees from the beginning of the three years to the end of Year 3.

• True
• False

A company conducts a study of how its number of employees has changed over three years. At the beginning of the three-year period, the company had 240 employees. The table shows the percent change in the number of employees during each year that followed.

Determine if the statement below about the number of employees is true or false:

The number of employees at the end of Year 1 was the same as the number of employees at the end of Year 3.

• True
• False

A group of friends shares a ride to a concert. Each friend's estimate of the time it will take to get to the concert is shown in the table. The actual time it takes to get to the concert is 60 minutes.

To the nearest whole percent, what is the percent error of each friend's estimate?

Groups:

(a) Less than 11% Error

,

(b) 11% to 20% Error

,

(c) Greater than 20% error

• Matt

• Erin

• Pete

• Wyatt

• Cherie

• 29%

• 40%

• 47%

• 71%

A bike is on sale for 30% off the original price of $120.

One way to determine the sale price of the bike is to find the difference of 120 and (a)   of 120. A second way to find the sale price is to ​ (b)   120 by ​ (c)   .

• 0.3
• multiply
• 0.7
• 0.07
• 0.03
• divide