Gulf Resources & Chemical said it has reached definitive agreements to sell its Lithium Corp. of America unit and its BS&B Engineering subsidiary for a total of about $150 million to FMC Corp. . . . United Cable Television of Denver said it purchased 2 million shares of its common stock at $40 per share pursuant to its tender offer . . . Listings on the New York Stock Exchange passed the 50-billion-share mark Thursday with the start of trading in TransCanada Pipelines Ltd. stock, the exchange said . . . The Investment Company Institute reported that the assets of the nation's 345 money-market mutual funds rose $172.9 million in the week ended Sept. 29 . . . The Los Angeles Department of Water and Power reported that electric usage for the week ended May 25 rose 2.3% over the previous week.