Solomon Sees Gains By Dollar
US Under Sec Anthony M Solomon says he expects dollar to strengthen as result of projected improvements in balance of payments and inflation rate and upward revaluation of West German mark; West Germany raises mark by 2% against most other European currencies; Denmark devalues krone by 3%; Solomon says US should have $10 billion surplus in balance of payments next years; says West German Chancellor Helmut Schmidt will meet with US Treas Sec G William Miller, Federal Reserve chairman Paul A Volcker and Solomon on Sept 29 in Hamburg to discuss closer US-West German monetary and economic cooperation (M)