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Pearson Algebra 1 Common Core, 2011 View details

9. Percents

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Exercise 17 Page 141

Use the percent proportion.

Practice makes perfect

In the percent proportion, the ratio of the part a to the whole b is equal to the percent p written as a fraction. a/b=p/100 Given any two of these three variables, we can find the third one. In this exercise, we are given the values p= 12.5 and b= 104, and we are looking for the value of a.

a/b=p/100

SubstituteII

b= 104, p= 12.5

a/104=12.5/100

MultEqn

LHS * 104=RHS* 104

a=12.5/100 * 104

MoveRightFacToNumOne

1/b* a = a/b

a=12.5*104/100

ReduceFrac

a/b=.a /4./.b /4.