



 
Ho Roxane, Suppose S is the selling price in dollars. Your cost is composed of two parts, the cost C before the commission and the commission D, both in dollars. I expect you calculate your profit margin M as a percent by
Again I expect the commission D is a percentage of S, say E% then
Hence
Thus
Finally if M is the margin and E is the commission, both as percentages then the selling price S is
If I have misinterpreted what you mean by margin or commission let me know. Penny  


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