a “business day” means aday on which banks in Hong Kong are opened for the transaction of normalbanking business (other than a Saturday or Sunday or any day onwhich no. 8 signal or above is hoisted or remains hoisted between 9:00 a.m. and12:00 noon and is not lowered at or before 12:00 noon during typhoon or onwhich is a black rainstorm warning is issued or remains in effect between 9:00a.m. and 12:00 noon and is not discontinued at or before 12:00 noon).