ln function on casio fx-9700ge

Discussion in 'Math' started by nerdegutta, Jun 12, 2011.

  1. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,515
    785
    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?
     
    Last edited: Jun 12, 2011
  2. nerdegutta

    Thread Starter Moderator

    Dec 15, 2009
    2,515
    785
    Got it.

    ln 2 / ln 1.07 = 10.2445

    It take 10.2445 years for it to be doubled.
     
Loading...