# Population INcrease

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• Mar 1st 2007, 04:05 PM
Dragon
Population INcrease
A township's population increased from x thousand to x+y thousand Find the percent of the population increase
• Mar 1st 2007, 04:23 PM
Aryth
Quote:

Originally Posted by Dragon
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)
• Mar 1st 2007, 04:38 PM
Dragon
so the answer is 100/x??
• Mar 1st 2007, 04:40 PM
Jhevon
Quote:

Originally Posted by Dragon
so the answer is 100/x??

No, the y's dont cancel, becuase the y at the bottom is a part of a sum not product