Chrysler Motors announced that Eagle Premier prices will increase by up to $600 effective with Jan. 2 shipments . . . Kemper/Bedford Properties' wholly owned subsidiary, Kaiser Development Co., has exercised its option to purchase Kaiser Hawaii Kai Development Co. from Kaiser Aluminum & Chemical Corp. for an undisclosed price . . . The Federal Reserve said the average yield for one-year T-bills, the most popular index for making changes in adjustable rate home mortgages, fell to 9.0% last week after averaging 9.10% the week before . . . Houston-based Baker Hughes Inc. reported that the number of working oil and natural gas rigs increased by 10 to total 940, marking the third straight week of gains.