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it is fifth root of 2 = exp (log 2)/5) = 1.1487 = 14.87%

The above applies to Compound Interest:

At Simple Interest I = PTR/100. In this case I = P, T = 5 and R is unknown.

100 x I = I x 5 x R ie 100 = 5 x R so R = 20%

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