# How to Calculate Percent Change?

Whenever you see a sale price (or a price increase), you may want to know how much the price has changed. Knowing the percentage change can help you make an informed purchasing decision.
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## How to Calculate an Average Percent Change?

Subtract the old value from the new value, divide the result by the old value and then multiply this by 100. The result represents the average percent change from the new to the old value. This can... Read More »

## How to Calculate the Percent of Population Change?

Over time, the population of towns, cities, states, countries and the world changes. Based on previous growth rates, you can predict future growth rates. Predicting growth helps governments to anti... Read More »
http://www.ehow.com/how_8087984_calculate-percent-population-change.html

## How to Calculate the Percent of Something?

Calculating the percentage of something is necessary if you want to find out of the proportions between two quantities. Some percentage calculations are easy and can be done without any helping too... Read More »
http://www.ehow.com/how_8054846_calculate-percent-something.html

## How to Calculate Percent Ripple?

Electricity spends most of its time between the power station and your D.C. devices as an alternating current. It is only transformed into a direct current after passing through an adapter or recti... Read More »
http://www.ehow.com/how_8480143_calculate-percent-ripple.html

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