Pre-Algebra Demystified

Change 95% to 0.95 and multiply 0.95 40 ¼38. Hence, the student got 38

problems correct.

EXAMPLE

A football team won 9 of its 12 games. What percent of the games played did

the team win?

SOLUTION

Place the 9 in the ‘‘part’’ section and the 12 in the ‘‘base’’ section of the circle

(see Fig. 6-14).

Then divide 129 ¼ 9  12 ¼ 0 :75. Hence, the team won 75% of its games.

EXAMPLE

The sales tax rate in a certain state is 6%. If sales tax on an automobile was

$1,110, find the price of the automobile.

SOLUTION

Place the 6% in the ‘‘rate’’ section and the $1,110 in the ‘‘part’’ section

(see Fig. 6-15).

120 CHAPTER 6 Percent

Fig. 6-13.

Fig. 6-14.