A federal bankruptcy judge approved a $100-million bank financing agreement that had been sought by LTV Corp. as an important step in the firm's reorganization . . . Saul Brandman, a Los Angeles investor, said he holds a 5.69% stake in Los Angeles-based Arden Group Inc. . . . 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 6.07% last week after averaging 5.99% the week before.