X = 7
y = 10
x + y = 700
7x + 10y = 6400
10x + 10y = 7000
(-) 7x + 10y = 6400
______________
3x = 600
x = 200
200 + y = 700
y = 500
The percent increase in population is: 87%
Further explanation:
The percent change is given by:

Given
Population before 10 years = 25800 people
Population after 10 years= 48200 people

Putting the values in the formula:

The percent increase in population is: 87%
Keywords: Percentage, Population
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