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Please Help. How to find period/years for a time value question? Business Finance?

How can I find N =years or period. When for example in how many years will $100 double if we have I= 5% N=? show the process and formula of how to find N= years/ periods

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  1. Present Value is 100, Future Value is 200, Rate is 5%. Solve for N. Answer is 14.2 Yrs Using the PV of $1 Tables, PV = FV x factor, so 100 / 200 = a factor of .50. Look down the table under 5% until you find .50(or close to it). At .5051, Periods = 14
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