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3.73% would do it almost exactly:

Where p is the original investment and i is the rate of interest:

3p = p((1 + i/100) to the power of 30)

dividing by p gives ((1 + i/100) to the power 30) = 3

using logarithms (log 3)/30 = 1 + i/100

antilog (0.47712/30) = 1 + i/100

antilog 0.0159 = 1 + i/100

1.037299 = 1 + i/100

0.037299 = i/100

i = 3.7299

Later: I tested this on Excel with capital of 5000 and interest rate of 3.73% and after 30 years investment was worth 15000.35!

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