Exercise 8 Page 148

In order to determine a percent change p, we can use the following general formula. p % =Amount of increase or decrease/Original amountFrom the given values, we can see the original amount was 9 and the new amount is 6, which shows a decrease. 9-6= 3 The difference between the new amount and the original amount is 3. Now we can use the formula.

Percent change=Amount of decrease/Original amount

SubstituteValues

Substitute values

Percent change=3/9

ReduceFrac

a/b=.a /3./.b /3.

Percent change=1/3

UseCalc

Use a calculator

Percent change ≈ 0.33

WritePercent

Convert to percent

Percent change ≈ 33 %

The percent decrease is about 33 %.