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As internet shopping gets more and more popular, it is very convenient for everyone to buy or sell on the internet. There is one question that sellers are mostly concerned with. How does one maximize the profit? Besides all the advertising methods on the internet, setting the price is also an important factor. Take eBay for example. There are two main selling options on eBay: “fixed price ” option and “online auction ” option. In order to earn the maximum profit, by describing the selling process of the item, an attempt is made to find the best selling price by some probability and statistical techniques. Setting the listing price is just one factor that affects the profit of products on eBay. We only consider two single selling options in this work. There are other types of selling options, and their combinations. This se