Barron's SAT by Brian Stewart

Author:Brian Stewart
Language: eng
Format: epub
Publisher: Barron's Educational Series
Published: 2017-05-12T04:00:00+00:00

CAUTION: Percents over 100%, which come up most often on questions involving percent in­creases, are confusing for many students. Be sure you understand that 100% of a particular number is that number, 200% of a number is 2 times the number, and 1000% of a number is 10 times the number. For example, if the value of an investment rises from $1000 to $5000, the investment is now worth 5 times, or 500%, as much as it was originally; but there has been only a 400% increase in value:

Example 5 ______________________________

The population of a town doubled every 10 years from 1980 to 2010. What was the percent increase in population during this time?

Solution. The population doubled 3 times from, say, 100 to 200 to 400 to 800. Therefore, the population in 2010 was 8 times the population in 1980, but this was an increase of 700 people, or 700%.

EXERCISES ON PERCENTS

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