What is the profit of 50 million in annual sales of e-commerce

To pure online medium and large stores, for example (Tmall store, more than 1 million stores), the profit is about 10%. Is to remove all the expenses, including labor costs, promotion costs, the cost of goods and so on; if you store the smaller the number of people, you profit may be the higher the profit, like a lot of individual sellers (Taobao store), operation, customer service, shipping to do it yourself, so the relative profit a little higher.