Exercise 69 Page 459

To determine percent change p, we can use the following general formula. p % =Increase or decrease in weight/Original weightFrom the given values, we can see the birth weight was 220lb and the weight at 1 month is 300lb. This is an increase in the amount. 300lb-220lb= 80lb The difference between the weight at 1 month and the birth weight is 80lb. Now we can use the formula.

Percent change=Increase in weight/Birth weight

SubstituteValues

Substitute values

Percent change=80/220

FracToDiv

a/b=a÷ b

Percent change=4/11

UseCalc

Use a calculator

Percent change=0.36

WritePercent

Convert to percent

Percent change = 36.36 %

RoundInt

Round to nearest integer

Percent change = 36 %

The increase in weight is 36 %.