An article in the Wall Street Journal discussed the financial results for BlackBerry, the smartphone and software company: "Revenue tumbled 32% from a year earlier to $658 million in the quarter ended May 30 from $966 million a year earlier... . BlackBerry posted profit of $68 million ... up from $23 million a year earlier." How is it possible for BlackBerry's revenue to decrease but its profit to increase? Doesn't BlackBerry have to maximize its revenue to maximize its profit? Briefly explain.