Amazon reported first quarter sales through the end of March after the close of the market on Thursday: Net sales rose 15 percent to $22.72 billion, with a net loss of $57 million, or 12 cents a share — slightly ahead of analysts’ expectations for the company. Media sales (the category in which they include books and ebooks) remain the lowest-growing part of their business, as in recent quarters: North American media sales of $2.969 billion were up 5 percent (or $144 million) but international media sales fell on the strengthening dollar. Sales of $2.32 billion were down 12 percent (or $322 […]