My Mom has a small stock of products like soaps and body oils, incense etc. they range in price from $5 - $20 and she has a friend who wants to sell them. He wont be buying the product at a discount price, he will be selling it first and then taking his commission out and giving her the rest. So what's a good commission rate for this? I would like a good example too, like how much out of a $100 would be his.

Thanks in advance!