By Arathy Somasekhar and Georgina McCartney HOUSTON (Reuters) -Oil jumped 3% on Tuesday to its highest level this month, as further attacks on ships in the Red Sea prompted fears of shipping disruptions and on hopes of interest rate cuts that could boost economic growth and fuel demand. Brent crude futures were up $2.32, or 2.93%, at $81.40 a barrel by 1:15 p.m. ET (1815 GMT). U.S. West Texas Intermediate crude rose by $2.26, or 3.1%, to $75.81. The rally, in thin trade with some markets closed for holidays, added to last week’s gains of about 3% after Houthi attacks on ships worried investors…