Baker Hughes Inc., Houston, reported that the...

Baker Hughes Inc., Houston, reported that the number of working oil and gas rigs in the United States jumped this week by 51 to total 945. A year ago, the count was 983 . . . The Federal Reserve said the average yield for one-year T-bills, the most popular index for making changes in adjustable-rate mortgages, rose to 7.89% last week from 7.85% the week before.