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Inglewood-based Hollywood Park Inc., which owns a greyhound and thoroughbred racetrack, said Louisiana officials approved its planned $216.5-million purchase of casino operator Boomtown Inc. . . . Meditrust SBI and Santa Anita Cos. said they amended their merger agreement to give Meditrust immediate control of as much as 30% of the thoroughbred race track operator’s stock, up from about 20%. . . . The Senate Finance Committee voted 16-4 to extend the federal tax break for ethanol through 2007. . . . U.S. agribusiness giant Archer-Daniels-Midland Co. signed an agreement to buy London-based ED&F; Man Group’s cocoa unit for $223 million in cash and assumed debt, a deal that would make ADM the world’s biggest cocoa processor.