Exercise 31 Page 142

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. Since we are trying to find the percentage of a number, we will find a part. We are given the values p= 9 and b= 56, and we are looking for the value of a.

a/b=p/100

SubstituteII

b= 56, p= 9

a/56=9/100

MultEqn

LHS * 56=RHS* 56

a=9/100* 56

MoveRightFacToNum

a/c* b = a* b/c

a=9* 56/100

ReduceFrac

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

a=9* 14/25

UseCalc

Use a calculator

a=5.04

The part is 5.04.