14. Percentage changes

You bought $15.25 worth of merchandise from a convenience store, but the final bill was $16.50. What is the sales tax rate?

7.6%

6.5%

8.2%

7.4%

6.9%

The height of a giant redwood tree is 160 feet, and the height of an oak tree is 120 feet. Taking the height of the redwood tree as the base value, the percentage change in height from the redwood tree to the oak tree is:

40.00%

16.67%

-25.00%

-10.00%

-12.50%

The university bookstore sold 4,100 textbooks last year and 4,600 textbooks this year. By what percentage did textbook sales increase over last year's sales?

11.90%

9.09%

12.20%

17.07%

14.29%

This year, 5,800 of the students are women. Last year, 4,000 of the students at Big State University were women. What is the percentage change in women who attended Big State University this year compared to last year?

32.60%

31.03%

54.00%

55.00%

45.00%

If the unemployment rate decreases from 6.1% in Year 1 to 4.2% in Year 2, then the unemployment rate decreases by and the percentage change in the unemployment rate is

The length of the Kaufman Bridge is 2,400 feet and the length of Bruner Bridge is 3,500 feet. Which of the following statements comparing the Kaufman and Bruner Bridges is correct? Check all that apply.

The Bruner Bridge is 1,100 feet longer than the Kaufman Bridge.

The Kaufman Bridge is 31.43% shorter than the Bruner Bridge.

The Bruner Bridge is 45.83% longer than the Kaufman Bridge.

The Kaufman Bridge is 1,100 feet longer than the Bruner Bridge.

The Bruner Bridge is 1,100 feet shorter than the Kaufman Bridge.

The Bruner Bridge is 31.43% longer than the Kaufman Bridge.