The U.S. dollar traded at the upper 90 yen level Monday in Tokyo. The dollar bought 90.77-79 yen at 5 p.m., up from 90.63-73 yen in New York and 90.69-70 yen in Tokyo at 5 p.m. Friday. The euro was quoted at 1.2427-2429 dollars and 112.80-84 yen, against 1.2380-2390 dollars and 112.34-44 yen in New York and 1. 2397-2399 dollars and 112.43-47 yen in Tokyo late Friday. 