# Precalc

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

• Precalc -

i tried solving this but got .23 instead of 26%

• Precalc -

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

• Precalc -

I think so, yes A = Pe^(r)(t)

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