Apple said it will open 25 additional retail stores in China within the next two years.

When discussing the company's expansion plans at an interview, CEO Tim Cook said Apple will add to the 15 Apple Stores currently operating in China. The Cupertino-based company is expected to have 40 shops up and running by 2016, PC Mag reported.

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"We're investing like crazy in the market," Cook said.

The Apple chief also sees an enormous market in China, saying "more people graduating into the middle class than any nation on Earth in history."

This week, Cook visited China to announce an expansion, talk about mobile security, and tour Foxconn Technology Co's iPhone factory in Zhengzhou.

"Great to meet talented people like Zhang Fan, who helps make iPhone 6 in Zhengzhou," the Apple's CEO tweeted after visiting the Foxconn factory.

According to Cook, "it's just a matter of time" before China becomes Apple's biggest revenue contributor.

During his trip in China, Cook also met with China's Vice Minister Ma Kai to discuss about "protection of users' information" and "strengthening cooperation" with regards to information and communication, reported news agency, Xinhua.

Tags retail stores, business expansion