If you know the answer and one of the parameters of the equation is an
unknown, then you can use goal seek.

The other way of tackling it is to say that the number of years
=LOG(A5/A1,1.04), where A5 is your inflated cost and A1 is your original
cost.
--
David Biddulph

"Eric" wrote in message
...
Won't that create a circular referance? I am trying to find Years. I know
"current cost" I know inflation rate and I know "system cost".

I need to find time it will take for "system cost" to eual acrued "current
cost" with 4% inflation

"David Biddulph" wrote:

The inflated price would be =A1*(1.04^A2) if A1 is the original price and
A2
is the number of years.
--
David Biddulph

"Eric" wrote in message
...
I just really need to know how to calculate the future cost if something
will
increase 4% yearly.

the "system" is a service we offer that eliminates "current cost"

"Bob I" wrote:

How can this system pay for itself? Does it generate income? Inflation
will tell you the future cost to replace the system.