Television retailer QVC began a series of layoffs that would result in the elimination of about 900 jobs, most of them in West Chester. The announcement came after a rough quarter. QVC's third-quarter revenue, ended Sept. 30, decreased 3 percent to $1.64 billion. Revenue in the United States fell 9 percent to $1.07 billion. The cuts at QVC, combined with other reductions, will save the company $30 million to $40 million a year when completed, said QVC's president and chief executive officer. He said the company remained "highly profitable."