GRE Math : How to find the percent of increase
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Example Question #71 : Percentage
A city originally had a 
One way to solve this is by considering that the increase in taxes is a linear addition of 2%. Therefore we can ask the question, 2% of what amount yields $150,000? This can be represented in the following equation:
0.02 * x = 150,000
Solve for x: $7,500,000
Therefore, the total at the old rate is 7,500,000 * 0.06 = $450,000.
Example Question #12 : How To Find The Percent Of Increase
In 2014, approximately 
To solve this problem, we must understand that we can't simply use the percentage change from 2013-2014 in order to solve this problem. Because the populations change, simply using the percentage change in order to is invalid. Therefore we must find the amount of people that were charming in each year to solve for this problem.
In 2013, 
In 2014, 
Therefore to find the percent increase of charming people, we simply find the difference in charming people from 2013-2014 and divide by the number of charming people in 2013. 
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