The Federal Reserve said the average yield...

The Federal Reserve said the average yield for one-year T-bills, the most popular index for making changes in adjustable-rate home mortgages, rose to 8.12% last week after averaging 8.07% the week before . . . Houston-based Baker Hughes Inc. reported that the number of working oil and gas rigs this week increased by eight to total 933. A year ago, the count was 1,130.