1. 6
Chapter
Chapter 2
Percent

2. Applications of Percent
Section
6.4
Applications of Percent

3. Solve Applications Involving Percent.
Objective A
Solve Applications Involving Percent.

4. Example
18% of Frank’s wages are withheld for income tax Find the amount withheld from Frank’s wages of $3680 per month.
18% of 3680 is what number?
percent
base
amount
Objective A
Thus, $ were held from Frank’s wages. 4

5. Example
Mr. Buccaran, the principal of Slidell High School, counted 31 freshmen absent during a particular day. If this is 4% of the total number of freshmen, how many freshmen are there at Slidell High School?
Now we solve for n.
Method 1
31 is 4% of what number?
31 = · n
Objective A
31 = 4% · n
There are 775 freshmen in the school.
continued 5

6. Example (cont)
Mr. Buccaran, the principal of Slidell High School, counted 31 freshmen absent during a particular day. If this is 4% of the total number of freshmen, how many freshmen are there at Slidell High School?
Method 2
31 is 4% of what number?
Objective A
base
amount
percent
There are 775 freshmen in the school. 6

7. Find Percent of Increase and Percent of Decrease
Objective B
Find Percent of Increase and Percent of Decrease

8. Finding Percent of Increase
Then write the quotient as a percent.
Objective A

9. Example
The average soft-drink size has increased from 13.1 oz to 19.9 oz over the past two decades. Find the percent increase. (Source: University of North Carolina at Chapel Hill, Journal for American Medicine)
First we find the amount of increase; 19.9 – 13.1 = 6.8.
Objective A
The amount of increase is 6.8. To find the percent of increase, 9

10. Finding Percent of Decrease
Then write the quotient as a percent.
Objective A 10

11. Example
John Smith decided to decrease the number of calories in his diet from 3250 to Find the percent decrease.
First we find the amount of decrease; 3250 – 2100 = 1150.
The amount of decrease is To find the percent of decrease,
Objective A 11