the square root of 100 is 10.
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Answer: 7.2% To compute this, realize that an interest rate of r% corresponds to a factor of 1 + r/100, each year. Hence, if I start with x, in ten years, the total will be x*(1+r/100)^10. If you like this to be 2x, you have to solve: (1+r/100)^10 = 2. hence, taking the 10th root: 1+r/100 = 2^(1/10) = 1.0718... and so, r = 7.2%
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There are 100 x 10 in 1000