Apple to increase investment in increasingly tough China

By Paul Carsten BEIJING (Reuters) - Apple Inc will boost its investment in China, one of its most important but increasingly difficult markets, and build its first Asia-Pacific research and development center in the country, Chief Executive Tim Cook said on Tuesday. Demand for Apple's phones has plummeted in China, and the government maintains a wary attitude towards foreign technology. Apple's new research and development center will be built by the end of the year, Cook told Vice Premier Zhang