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ln function on casio fx-9700ge

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nerdegutta

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nerdegutta

Joined Dec 15, 2009
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Hi.

I got this casio fx-9700ge, and I want to learn how to use the ln-button. I know I can use it to solve this question:

For how long does 5 000 have to stay in the bank to be doubled, with 7% interests?

I know the answers, it's 10,2448 years.

But how can I use the ln button to find out?
 
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