TOKYO, March 2 (Reuters) - State-run Saudi Aramco has set its March contract price for propane at $500 a tonne, up $50 from the February level, industry sources with direct k**wledge of the matter said on Monday. The prices provide a benchmark against which Middle East sales of liquefied petroleum gas (LPG) to Asia are priced. Following is a table of Saudi Aramco's contract prices of propane and butane per tonne in U.S. dollars. Product March Feb Change propane 500 450 +50 Butane 460 480 -20 (Reporting by Osamu Tsukimori; Editing by Richard Pullin)