A drilling company must decide whether or not to drill oil at some site. The company can drill the site for a price of paid up front. Afterwards, the company will learn if there is actually oil at this site. If there is oil, the company will generate in revenue. If there is no oil, there will be no future profits. Let be the probability there is oil at this site. What is the minimum value of such that the company should drill if they act rationally?