Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: BHP Wins Extra \$3.2 Bln of Chinese Iron Ore Sales (Update3) BHP Billiton, the world #39;s biggest mining company, agreed to sell an extra \$3.2 billion of iron ore to four Chinese steelmakers, helping underpin expansion of its mines in Western Australia.

Business