Lotus Development Corp. will repurchase up to...

Lotus Development Corp. will repurchase up to 15%, or 6.7 million, shares of its common stock outstanding . . . Bayer USA Inc., a subsidiary of Bayer AG of West Germany, said it will merge subsidiaries Agfa-Gevaert Inc., Compugraphic Corp. and Matrix Corp. into one corporation at the end of the year . . . 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 8.09% last week after averaging 8.24% the week before . . . Houston-based Baker Hughes Inc. reported that the number of working oil and natural gas rigs in the United States increased this week by five to 938. A year ago, the count was 1,108.