Business Math For Dummies
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You can track how long it takes to double your investment if you deposit money at a specific interest rate. For interest rates that fall between the rates in the chart, remember that the time will fall in between also.

Interest Rate Compounded Quarterly Amount of Time Needed to Double
2% ª 34.7 years
3% ª 23.2 years
4% ª 17.4 years
5% ª 13.9 years
6% ª 11.6 years
7% ª 10.0 years
8% ª 8.8 years
9% ª 7.8 years
10% ª 7.0 years
11% ª 6.4 years
12% ª 5.9 years
13% ª 5.4 years
14% ª 5.0 years
15% ª 4.7 years

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Mary Jane Sterling is the author of four other For Dummies titles: Algebra For Dummies, Algebra II For Dummies, Trigonometry For Dummies, and Math Word Problems For Dummies. She has honed her math-explaining skills during her years of teaching mathematics at all levels: junior high school, high school, and college. She has been teaching at Bradley University, in Peoria, Illinois, for almost 30 of those years.
When not teaching or writing, Mary Jane keeps busy by working with her Kiwanis Club, advising Bradley University’s Circle K Club, and working with members of the Heart of Illinois Aktion Club (for adults with disabilities). All the volunteer projects taken on for these clubs help keep her busy and involved in the community.

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