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If the title doesn't make sense I will try to explain via example.

There were 100 apples, 80 were purchased; 80% were purchased Add 100 to each, apples and purchases 200 apples, 180 purchased; 90% were purchased 300 apples, 280 purchased; 93.33% were purchased etc. Is there a formula/rule that can be applied which will show the relationship of the values?

I guess what I mean is, is there a rule governing by what increment the % purchased will change for each increment of 100 apples? What if it were 60 apples?

Vidro3
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    Maybe assign some letters to the quantities like : $N$ apples, $n$ purchased, then add $k$ to both variables : $N+k$ apples, $n+k$ purchased. Calculate percentage and see how it grows. If you're familair with calculus, this tells everything : http://www.wolframalpha.com/input/?i=%5Clim_%7Bk%5Cto%5Cinfty%7D+%28%5Cdfrac%7Bn%2Bk%7D%7BN%2Bk%7D%5Ctimes+100%29 – AgentS Aug 28 '14 at 22:29

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