Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Continuously compunded interest

  1. Jan 30, 2009 #1
    1. The problem statement, all variables and given/known data
    The island of Manhattan was sold for $24 in 1626. Suppose the money had been invested in an account which compounded interest continually.

    a) How much money would be in the account in the year 2005 if the yearly interest rate was:
    i: 5%? ii: 7%

    3. The attempt at a solution

    I put the numbers into the function P0ert and got

    i:24e.05(379) and ii:24e.07(379)

    but when I put that in my calculator I get VERY large numbers:

    i: 4074662794 and ii: 7.980752573E12

    For some reason, I don't think the homework answers would be such ridiculously large numbers. Did I do this right?
    Last edited: Jan 30, 2009
  2. jcsd
  3. Jan 30, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    The numbers are ridiculously large but that doesn't mean they are wrong. Exponential growth is fast and 379 years is a ridiculously long time. I think you are correct.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook