Posted by **Amy** on Wednesday, January 12, 2011 at 7:36pm.

What annual rate of interest is required to double an investment in 3 years?

- Precalc -
**Amy**, Wednesday, January 12, 2011 at 8:08pm
i tried solving this but got .23 instead of 26%

- Precalc -
**helper**, Wednesday, January 12, 2011 at 8:21pm
I know at 7% interest an investment will double in 10 years, but this doesn't help you.

let me see what I can find

is your problem simple interest?

- Precalc -
**Amy**, Wednesday, January 12, 2011 at 8:25pm
I think so, yes A = Pe^(r)(t)

- Precalc -
**This question is still open please help**, Wednesday, January 12, 2011 at 9:23pm
please help

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