Stockholders of Healthgroup International have approved the...

Stockholders of Healthgroup International have approved the proposed acquisition of Healthgroup by Hospital Corp. of America . . . Malibu Grand Prix said its creditors will act by July 29 on its request for more time to make a $1-million payment on a $24-million note . . . Fairmont Insurance expanded its workers compensation and contract bonding business into San Diego with the opening of a branch office . . . General Tire said 150 to 175 employees at its Mayfield, Ky., tire plant will be placed on indefinite layoff this month.