FIGURES from the Hong Kong Monetary Authority show that rates levelled off at the sale of Exchange Fund bills and notes. The authority said the Exchange Fund's offering of $1.5 billion worth of 91-day bills yesterday, attracted $2.92 billion worth of bids. It allotted $1.5 billion at an average accepted yield of 5.76 per cent. The fund also allotted $800 million worth of 182-day bills at an average yield of $5.79 per cent, after attracting $1.52 billion worth of bids. Bidding was down on last week, when the 91-day sale alone drew $4.82 billion more bids than the total for both the 91-day bills and 182-day paper yesterday. Yields have soared in recent weeks, particularly with the benchmark 91-day bills, which were being placed at the start of August at an average of 5.45 per cent.