Thanks Tom, Dana and Keyt for your help.

There turns out to be one more variation to this that I'm hoping one of you
can help me with.

Given this:

K = -1000
K2 = 500.0011
R = 1/120 = 0.0083333333..
N=5

K2 = (K*(1+R)^-1) + (K*(1+R)^-2) + (-A*(1+R)^-3) +
(+A*(1+R)^-4) + (+A*(1+R)^-N)

Again, how do I solve for A?

In this case A equals 2,602.01

TIA,
Karl


"Karl Thompson" wrote in message
...
Once again, I need a general equation that will solve for "A". Can
someone
tell me what that would be please?


K = -1000
R = 0.0083333
N=5

A = (K*(1+R)^-1) + (K*(1+R)^-2) + (-A*(1+R)^-3) + ... + (A*(1+R)^-N)

FYI: In this case I know A equals -40,554.920

Please note (don't know if it's important) that "A" can be negated one or
more times..

TIA