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i want to know if there is some function to obtain the sell-buy rate.
It seems to increase the porcentage of lose for lower prices items, than the high- priced ones.
I took this info on some current online prices
Sell- Buy- Profit %
30- 130- 433%
50- 150- 300%
60- 160- 267%
70- 160- 229%
80- 180- 225%
90- 180- 200%
1800- 2400- 133%
2900- 3700- 128%
6000- 8000- 133%
I can graphic it (i don't know how to put a graphic here) and some formulae may be obtained. any help?
You can upload graphics here  and then in page you want the graphic be visible type:
where filename.png is a file you uploaded.