P231 ORACLE 231 Fri31 Dec ITN 0030:00       Prices closed sharply lower on Thursday in the wake of a sharp and unexpected rise in short-term interest ratesN Six banks raised to 11.5% the interest rate charged to brokers. The Dow Jones industrial average ended the day 12.23 lower at 1047.37 Declines led advances by 910 to 665 among the 1,950 issues traded and volume rose to 56.3 million shares from 54.8 million on WednesdayN Investors paid little attention to some favourable economic reportsN