(NASDAQ: AAPL) has been growing revenue around the world thanks to top products like the iPhone and Mac and sales of its services. In fact, in the most recent quarter, Apple reached record revenue in more than two dozen countries and regions. And that helped the company increase earnings per share by 16% in the reporting period.

But one particular country is representing a challenge for Apple these days, and unfortunately, that country is key to growth as it generally makes up about 20% of Apple's total sales. I'm talking about China. In the quarter, Apple's revenue there sank 13%, and its operating income in China dropped 17%. Should you worry about these declines in such a significant market? Let's find out.

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Source Fool.com