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<<If your example was 3 years. would you take the 3rd root (.33) of 3.5?
Also--I don't understand what you did on the calculator.could you explain this again?>>

Yes, if the period was 3 years, you'd take the 3rd root.

Regarding the calculator, it's just that many of them don't let you simply punch in the root you want to take. They may have a square root button, but no other root ones.

In that case (since my calculator is in the group above), my workaround is this:

-- For a period of 5 years, to take a 5th root, I punch in: (let's say I need the 5th root of 3.5)

3.5 ^(1/5)

The ^ is the exponent function key, appearing on my calculator as: "y^x", or y to the xth power

Since I can use parentheses on my calculator, I do. If yours doesn't offer it, you can do some of the math in an earlier step, figuring out that (1/5) is 0.2 or (1/3) is .33 or (1/4.5) is 0.222.

Hope that helps!

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