# Thread: Finding future value interest

1. ## Finding future value interest

Ok so basically I need to find the interest rate. Here's my work so far:

Using the formula A=P(1+i)^n

P = 4000, A = 5983.66, m = 4, t = 9, r = r/4, n = 36.

So I plug it in and eventually I get to:

(5983.66/4000)^1/36 - 1 = r/4

How do I calculate this so that my answer isn't negative? I put it in the calculator and it comes up completely wrong. I'm gonna have to ask you to have patience with this one and tell me how you put it on the calculator because I'm a bit confused. Thanks for your help

2. ## Re: Finding future value interest

what kind of calculator are you using? Your equation is definitely correct and I calculated r = 4.5%
Try to add more grouping symbols, maybe enter it like this:
(((5983.66/4000)^(1/36)) - 1) * 4 = r
did you get it now?

3. ## Re: Finding future value interest

Yes! That helps so much! Thank youuu.

I'm kind of teaching this stuff to myself in an online class so I couldn't find that advice anywhere. You've made my day !!!