# Chapter 7: Percent

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```					Section 7.4

Applications of Percent
The freshman class of 450 students is 36%
of all students at State College. How many
students go to State College?

Equation Method
State the problem in words, then translate
to an equation.
In words: 450 is 36% of what number?
Translate: 450 = 36% •                        x

Solve:   450 = 0.36x

2
Martin-Gay, Prealgebra, 5ed
The freshman class of 450 students is 36%
of all students at State College. How many
students go to State College?

Proportion Equation Method
State the problem in words, then translate
to a proportion.
In words: 450 is 36% of what number?
amount percent   base
450 36
Translate and Solve:     =
b   100

3
Martin-Gay, Prealgebra, 5ed
Percent Increase
Percent Decrease
amount of increase
percent increase =
original amount

amount of decrease
percent decrease =
original amount

In each case write the quotient as a percent.

Make sure that this number in the denominator is the
Helpful Hint   original number and not the new number.
4

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