A township's population increased from x thousand to x+y thousand Find the percent of the population increase
To find the amount that the population increased, we subtract the original population from the new population:
x + y - x = y
We then plug it into a percent equation, which says, what percent of (x + y) is y, which is our increase:
(x + y)*n = y
(x + y)n = y
n = y / (x + y)
Where n is the percent increase, make sure you multiply n by 100 to get the decimal in terms of percentage, which makes your equation this:
n = 100*(y) / (x + y)