In order to add percentages you will need to multiply the starting number by 1 plus the percentage of the fraction. An example of this would by 25000 plus 9% = 25000 times 1.09 which equals 27250. It can be confusing at first, but with a little practice it becomes quite easy. To subtract percents, you would multiply the number by 1 then subtract the percentage fraction. If you have a calculator with a % sign on it, you can do it easily on a calculator.
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