Many real-life problems involve adding and subtracting percents. For example, percents can represent answers in polls, votes in an election, or portions of a budget, and the total often has to add up to 100%. You may also see such information organized as a pie chart. Here’s an example:
In a recent mayoral election, five candidates were on the ballot. Faber won 39% of the vote, Gustafson won 31%, Ivanovich won 18%, Dixon won 7%, Obermayer won 3%, and the remaining votes went to write-in candidates. What percentage of voters wrote in their selection?
The candidates were in a single election, so all the votes have to total 100%. The first step here is just to add up the five percentages. Then subtract that value from 100%:
39% + 31% + 18% + 7% + 3% = 98%
100% – 98% = 2%
Because 98% of voters voted for one of the five candidates, the remaining 2% wrote in their selections.
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Source:http://www.dummies.com/how-to/content/calculate-percentages-using-addition-and-subtracti.html
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