5.1 Percent Increase & Decrease NAME: __________________________ DATE: _________ PER:______
Example 1:
1: Last year, 2,376 people attended the rodeo. This year, attendance was 2,950. What was the percent of change in
attendance to the nearest whole percent?
Since this year’s attendance is greater than last year’s attendance, this is a percent of increase.
The amount of change is 2,950 – 2,376 or 574.
Find the % of change. Round to the nearest whole %.
% State whether the change is an increase or decrease.
1.
Original: 4
New: 5
2.
Original: 1.0
New: 1.3
3.
Original: 15
New: 12
4.
Original: $30
New: $18
5.
Original: 60
New: 63
6.
Original: 160
New: 136
7.
Original: 7.7
New: 10.5
8.
Original: 9.6
New: 5.9
9.
Original: 35
New: 70
10.
8 feet to 10 feet
11.
$0.32 to $0.37
12.
136 days to 85 days
13.Recent advances in surgical technology have changed the average healing time for some operations from 8
weeks to 3 weeks? What is the percent of decrease for the new healing time? ___________
15. Jack’s grade in Math for the first nine weeks was an 88. His second nine weeks grade decreased by 12.5%. What was
his grade for the second nine weeks? _____________
16. In 1967, a 30-second Super Bowl commercial cost $40,000. In 2000, a 30-second commercial cost $1,800,000. What
was the percent of change in the cost of a commercial? Was it an increase or decrease? _____________
17. The Amazon online company started with 450 employees. Since, it has begun a new section called Amazon Prime
and must increase its number of employees by 18%. How many total employees does the company now have?
_________________
18. Shannon had 765 cards in her baseball collection. She sold 153 of the cards to purchase a new iPod. What is the
percent of change in the number of Shannon’s baseball card collection? _______________
19. Caroline, an employee of Hollister, bought a sweater that was originally priced at $55, for $38.50 using her employee
discount. What percent off is the employee discount? ______________
Solve. Show your set up in the space inside each box.
20.
20.
Reebok running shoes costs Footlocker $68 for each
pair. If Footlocker sells the shoes to the public for $119,
what percent of increase in the price has the store
charged the public?
21.
21.
Last year Cobb’s Chess club had 30 members. This year the
club has 24 members. Find the percent of decrease in the
number of members
.
22.
22.
In the seventh grade, Angelina read 15 books while in
Ms. Gusman’s class. In the eighth grade, she read 18
books while in Mr. McCrimmon’s class. Find the percent
of increase in the number of books Angelina read.
23.
23.
Last year 762 students attended the Home Coming game at
Leon High School. This year 721 students attended. What
was the percent of change in the number of students that
attended to the nearest tenth?
24.
24.
The 2011 yearbook at Springfield Middle School had
236 student-selfies. This year’s yearbook has 214
student-selfies. What was the percent of change in the
number of selfies from 2011 to now? Round to the
nearest tenth? Then, tell if it’s an increase or a
decrease.
25.
25.
In 2000, Florida’s population was 15.9 million. In 2012, the
population was estimated to be 18.8 million. Find the
percent of increase to the nearest whole number.