Answer is as attached.
MIDDLE SCHOOL MATHfractions
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Percent increase is a percent change that describes an increase in quantity
To determine percent increase we first find the amount of change
It is given:A tree grew from 4ft to 12ft in 3 years .
Amount of change =12-4=8 ft.
We use proportion to find percent increase.
Or ,
Cross multiplying we have:
4 ( percent Increase )= 800
Dividing by 4 we have Percent change = 200
Percent Increase = 200%.