Alibaba, the Chinese e-commerce company that held the world’s largest initial public offering in September, reported strong sales growth in its first earnings report as a public company on Tuesday. For the three months ending on September 30, Alibaba’s net profit fell 38.6% to $494 million, or 20 cents a share. Excluding one-time items like those associated with stock-based compensation, the company reported net income of $1.11 billion, or 45 cents per share. A group of 25 analysts polled by Yahoo expected an average profit of about 45 cents per share.