Lenovo Group Ltd , the world’s biggest PC maker by sales, said on Thursday its annual net profit rose one percent to $829 million, slightly below analyst expectations, as it completed two major acquisitions during that year. The Beijing-based firm closed in October its $2.1 billion acquisition of IBM’s low-end server unit and also its $2.9 billion purchase of Motorola, and these purchases weighed on its profit for the year that ended March 31. Analysts had forecast a net profit of $857 million.