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February 3rd, 2012, 01:04 PM   #1
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formula for calculating an changing percentage

Hi,
I have a problem with finding the right formula. Normally you can use f(x)=a*(1+b))^x (a = base value, b = percentage, like 0,25)to calculate the absolute number of sth.
But I have a formula to claculate the percentage depending of x, so its changing all the time (decreasing to nearly zero).
The formula above doesn't work anymore, but i havenīt found other.

Can you help me???

If you don't understand what i mean, ask....english is not my native language and its hard to ecpress sth in it
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