If a $10 investment is worth $30 today, how long ago must that $10 have been invested at 9% interest

Algebra
Tutor: None Selected Time limit: 1 Day

If a $10 investment is worth $30 today, how long ago must that $10 have been invested at 9% interest computed twice a year?

May 17th, 2015

12 years!..................................................................

May 17th, 2015

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May 17th, 2015
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May 17th, 2015
Mar 27th, 2017
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