PERCENT INCREASE OR DECREASE

HOW CAN YOU USE PERCENTS TO SHOW CHANGE?

Example: To show what percent the prices increase or decrease.

X = Difference between two amounts100 Original Number

EXAMPLE 1 Prices at a local electronic

store have changed over the years. By what percent did the prices increase or decrease for the stereo system?

X = Difference between two amounts

100 Original Number

X = 37

100 98.95

98.95X = 3700

X≈ 37.4%

Item 1994 2004

StereoSystem

$98.95 $135.95

Cell Phone

$245 $159

EXAMPLE 2 What percent did the

prices change for the Cell phone?

X = Difference between two amounts

100 Original Number

X = 86

100 245

245X = 8,600

X≈35.1

Item 1994 2004

StereoSystem

$98.95 $135.95

Cell Phone

$245 $159

John David is at the mall and wants to buy a T-shirt that he saw last month for $20. The T-shirt now costs $25. Find the percent increase or decrease.

X = 5 100 20

20X = 500

X≈25% Increase

RAGS TO RICHES….

http://www.quia.com/rr/230204.html

1.) Joznel wants to buy a jacket at Justice for $72.00. The jacket is now on sale for $54.00. What is the percent decrease?

2.) Izzi wants to buy a pair of shoes that originally cost $48. The shoes are on sale and now cost $68. What is the percent increase?

3.) The pair of basketball sneakers Ross wants to buy is on sale for $114. The original price of the sneakers were $120. What is the percent increase?

4.) Michael wants to buy a authentic Phillies jersey for $189.00. The jersey is now on sale for $159.00. What is the percent decrease?

5.) There are 14 people in class on Tuesday. There are 20 people in class on Wednesday. What is the percent increase?

6.) Kayla needs a new tennis racket. The price of the racket is $65.99. The racket is on sale for $52.95. What is the percent decrease?

7.) Ms. D is shopping for earrings at Kohl’s. She finds a pair for $36.95. They are on sale for $19.99. What is the percent decrease?

8.) Layne is at Pacific Sunwear and wants to buy a pair of pants she saw last week for $32.50. The price of the pair of pants is now $45.50. What is the percent increase?

9.) On Monday, only 15 students brought their textbook to class. On Tuesday, 22 students brought their textbooks to class. What is the percent increase?

10.) Ms. Nelson also works at Express and receives a store discount. She bought a $75 jacket for $60. What is the percent decrease?

11.) Megan wants to a ticket for the upcoming Justin Bieber concert. The original price of the concert is $48. The ticket price increased due to popular demand and is now $60. What is the percent increase?

12.) Mrs. Heywood normally gets wonton soup for lunch. The original price is $4.50. The Chinese restaurant just increased their prices and the soup now costs $5.50. What is the percent increase?