MADRID, August 20 (Reuters) - Spain announced the following results at Tuesday's Treasury bill auction BANCS. (Amounts bid, allocated in millions of euros) ISSUE YIELD PREVIOUS PRICE PREVIOUS BID ALLOCATED 3-month -0.528 -0.518 100.124 100.121 2,020 550 9-month -0.546 -0.472 100.395 100.360 4,050 1,025 The bid-to-cover ratio on the 3-month bill was 3.7 versus 3.4 at the last auction. The bid-to-cover ratio on the 9-month bill was 4.0 versus 3.1 at the last auction. For further information, click on TESORESP08 and BANCS.