General Dynamics reported that its $680-million merger with Cessna Aircraft has been completed . . . MCI Communications reported the completion of its purchase of Satellite Business Systems from IBM in a $375-million deal . . . Honda Motor said that, effective immediately, it is raising the suggested base prices on its cars an average of 3.6% . . . After meeting with all 170 of its lending institutions in an effort to extricate itself from technical default on $600 million of its $2.5-billion debt, Eastern Airlines said a "positive response" from the lenders is expected "within days" . . . Dillard Department Stores completed its purchase of 12 stores in Kansas from R. H. Macy & Co. . . . Pulitzer Publishing reported that its board of directors voted to recommend to its shareholders that they reject a Taubman Media takeover offer. . . . Humana Inc. has agreed to accept the Sears Discover Card at all Humana hospitals and Med first units effective April 1.