Exercise 29 Page 149

To determine the percent change p, we can use the following general formula. p % =Amount of increase or decrease/Original amountFrom the given dollar amounts, we can see that the new amount is greater than the original amount. To find the increase, we have to subtract the original amount from the new one. 234.56- 168.45= 66.11 Knowing how much the amount increased, we can then use the formula to calculate the percent increase.

Percent change=Amount of increase/Original amount

SubstituteValues

Substitute values

Percent change=66.11/168.45

UseCalc

Use a calculator

Percent change=0.392460...

RoundDec

Round to 2 decimal place(s)

Percent change≈ 0.39

WritePercent

Convert to percent

Percent change≈ 39 %

The percent change is approximately 39 %.