Culver City-based Ashton-Tate has named Chiat/Day, San Francisco, as its advertising agency of record . . . Hewlett-Packard has acquired an 11% equity interest in Cericor Inc., a Salt Lake City firm that develops advanced computer-aided engineering software tools . . . SCOA Industries has entered into a definitive merger agreement on a previously reported leveraged buy-out offer worth at least $574 million . . . Beverly Hills-based International Lease Finance has declared a 3-for-2 stock split payable July 25 to stockholders of record July 15 . . . The Investment Company Institute reports that the assets of the nation's 347 money-market mutual funds rose $876 million in the week ended July 10.