- J Cl)c toasljiiujton post  
The Bank of Montreal will buy Harris Bankcorp, parent of Harris Bank, for $546.6 million, or $82 a share, according to a definitive merger agreement announced yesterday.</br></br>The move means the Bank of Montreal becomes the biggest Canadian financial institution in the United States and the second larg-est ih Canada in terms of financial assets.</br></br>The price for ChicagoÛªs third largest bank, with assets of $7.6 billion, will be about 1.27 times its expected book value at the time the acquisition is completed later this year, Bank of Montreal Chairman William D. Mulholland said. The purchase rs subject to approval by federal regulators and Harris stockholders.</br></br>Brazil is asking its bank creditors for some $12 billion in new money and rescheduled loans through 1984, a finance ministry source in Brasilia said yesterday.</br></br>The source, asking not to be named, confirmed reports' Brazil is asking the New York-based bankers committee that coordinates debt renegotiation with some 800 individual banks to roll over maturity; debt for nine years and for five-year terms on the new money it is asking through the end of next year.